One of the big UI wins for the web browser is that it allows one to build content-specific browsers (i.e., in 100% HTML / CSS / JS). And, it’s great to see sites pushing beyond web page “document” defaults to make browsers more appropriate for different content / experience / interaction.
I really dig what thesixtyone.com is doing! But, the site is definitely weakest with regards to the text content that traditionally would scroll down the page.
I think there are a lot of interesting potentials for how one might arrange interfaces that transition between both music / media and text / hypertext. The iTunes file library model ain’t it, but thesixtyone and what you’ve done with WaxMP3 are the great examples!