I'm tempted but will ultimately pass on the Squeezeboxes and docks - mainly because I don't want people to fuss with source selector buttons and crap on the DAC - especially because it is such a large meet and open to more people than usual. The last thing I want is someone going" "no sound", and fussing with the volume control until a selector is switched, and then "boom." Variations of this scenario have actually happened to me at other large "public" meets.
Just going to keep things simple: CD-Player Play Button + Amp Volume Control (at least at the main event - the side events are another thing.)
ADD: I guess what I'm trying to say, and I can't speak for others, but I know at least two other persons bringing TOTL rigs, and I'm pretty sure they are not going to let random people they don't know fuss with their (CD Player based) rigs. So if you want to hear your stuff on 'em, bring a CD.