anyone interested in AAC encoders should check out the latest public listening test. It's a combined community effort initiated by IgorC, to see how well different AAC encoders perform.
Follow the readme/instructions closely if you want to participate, the test is scheduled to end in a week.
The official discussion thread can be found on the HA forums.
Btw, here's a link to the previous test in case you missed the results.
Edited by xnor - 7/20/11 at 7:55am