There's a 128kbps (blind!) MP3 listening test going on there:

http://www.hydrogenaudio.org/forums/index.php?showtopic=66564

This really is a good use of your time, if you think you're up for it. The ultimate goals here are to see if the latest versions of LAME are better than earlier versions, and if other encoders (iTunes, Helix, etc) compete with LAME. While this obviously doesn't impact high-end audio in any way, it does impact people's choices of MP3 encoders at these bitrates: for online music downloads, podcasts, for storage-constrained devices like flash players, when one wants to avoid less supported formats like AAC and WMA, etc.

In a very real sense, this volunteer work will improve sound quality on a wide scale.