As an aid to all the noobs who can't be bothered to read the entire thread, I thought it might be useful to have links to all the most useful ifi posts in one place. Someone at ifi Audio might like to copy and paste this into the very first post.
Noobs start here:
Tech Talk with Thorsten - part 1 - iDSD core specs, take one
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/30#post_10399550
Tech Talk with Thorsten - part 2 - why Burr-Brown
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/60#post_10404689
Tech Talk with Thorsten - part 3 - why not balanced
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/135#post_10422306
Which USB Asynch does ifi use? AMR's of course!
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/375#post_10482095
Designer's Diary - 1 - early mechanical design
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/315#post_10467562
Designer's Diary - 2 - power supply gremlins, back to the drawing board
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/405#post_10496728
Designer's Diary - 3 - three prototypes
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/450#post_10518630
Software Design Team's Notes - 1 - the XMOS solution
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/510#post_10545817
Software Design Team's Notes - 2 - star clocking
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/525#post_10569555
The Final Countdown
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/555#post_10583107
Super-Duper Features 1.1 - the dual-core Burr-Brown DACs
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/585#post_10585670
Super-Duper Features 1.2 - filters, ringing
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/615#post_10591026
Software Design Team's Notes - 3 - ARM microprocessor, automated extras
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/630#post_10599164
Super-Duper Features 1.3 - the intelligent SPDIF port
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/630#post_10602951
Super-Duper Features 1.4 - why not femto clocks?
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/645#post_10606215
Measurements Matter (Not!) Part I of III – Hearing a fly fart at 20 feet - Signal to Noise Ratio
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/660#post_10611007
Technical Notes - 3 - cherry picking the chipset
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/690#post_10617050
Super-Duper Features 1.5 - direct/pre-amp output, ALPS micro switches, volume pot
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/720#post_10623177
Super-Duper Features 1.6 - 3D holographic for headphones and speakers
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/720#post_10625021
Outta This World 3 and Super-Duper Features 1.7 - SmartPower and turbo mode
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/735#post_10627797
Addendum: Super Duper 1.7 SmartPower: charging details
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/735#post_10628199
Power Supply Special - 1
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/765#post_10631317
Power Supply Special - 2
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/765#post_10633478
Super-Duper Features 1.8 - the 3.5mm analogue input
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/795#post_10635371
Software Design Team's Notes - 4 - DSD, no ordinary DSD
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/825#post_10641278
Why not "more modern and/or better spec chips"?
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/840#post_10641478
Super-Duper Features 1.9 - signal polarity +/-
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/855#post_10643380
Outta This World 2 - turbo/normal/eco and IEMatch
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/885#post_10646012
Super-Duper Features 2.1 - the CCK/OTG USB port
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/990#post_10658655
Software Design Team's Notes - 5 - digital and analogue filters
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/1050#post_10662147
Outta This World 1 - octa-DSD
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/1050#post_10664154
The 'Octa-Adopter' 512 units and what is iClub?
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/1080#post_10667244
Super-Duper Features 2.2 - built-in iPurifier
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/1125#post_10671925
Addendum on the CCK/OTG Port and what accessories are included in the box
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/1140#post_10674374
Jitter Measurements
http://www.head-fi.org/t/711217/idsd-micro-crowd-design-the-meaty-monsters-are-flying-out-page-95/1200#post_10676898
Feel free to copy this and add to it if necessary.