looks interesting, I'm not sure the signup/intro page quite put across _why_ I should use the service enough, I only 'got it' a bit later. But as a set hosting service I would probably use it anyway.
few thoughts (some already covered):
* buttons look disabled, I was waiting for them to un-ghost
* the "skip" links should be more prominent during signup since at the time it slowed me down.
* signup/design was generally very friendly
* please don't alert me to sign-out, I know what I'm doing, and it's not that bad if I made the mistake
few thoughts (some already covered):
PS: enjoy my set http://mixlr.com/chrisfarms/euromuxer