Google itself: success, though a "Please click here if you're not redirected" page appeared for a moment.
Livejournal: success, though the gradient fill on the navigation bar has vanished. I always thought that was an image, but apparently there's some JS wizardry involved.
A wordpress blog: success, though rounded corners have disappeared. I happen to know that site uses CSS3 PIE to achieve them, so that's to be expected.
BBC News: almost success - the regional news box has disappeared, and various tabbed/scrolling areas have now expanded to show everything.
The Register: almost success - only one top story appears, instead of cycling through 5.
Youtube: fail! A black box appears instead of the video, no thumbnails appear for other videos in the recommended list, and no user avatars appear. Interestingly the videos in the recommended list now have names like "<b>EEvBlog</b> #407 - Mailbag" - the HTML tags don't appear with JS turned on.
Slashdot: epic fail! It's amazing how much site layout relies on JS these days, though to be fair to them I think they're also relying on something like HTML5shiv.
My host's webmail: success, despite a big scary warning.
Yahoo webmail: fail - the page starts to appear, but then you get redirected to a big scary warning. Amusingly, the instructions on how to enable JS are for Firefox.
Fanfiction.net: partial success, as long as you don't want to see someone's favourites, and are only interested in the first or last chapters of any story. It also looks like they were delay-loading some images.
Craig's site: success, including the dynamic menus, the RSS feed dropdown, and the buttonless search box. CSS for the win!
Jonners' site: success, apart from the main menubar is broken - but that never rendered sensibly in IE8.
Facebook: marginal success - while the news feed does display, little else does and half the links don't do anything. The messaging section in particular is somewhat lacking in messages.
Jazz 2 online and the JCF: success!
deviantART: success - the galleries and suchlike work surprisingly well, but the messaging system doesn't.
OCRemix: almost success, as long as you don't want to actually listen to any music.
Songmeanings.net: mostly success - you have to scroll down a screen's worth before you actually get to anything.
Bing maps: fail!
Google maps: epic fail - it redirects you to the main search page
Ordnance Survey Get-a-map: fail - despite using Silverlight, it relies on JS to bootstrap the page.
National rail: amazingly, success.
Southern rail: almost success - the journey planner needs JS, but also shows a link to a non-JS wizard that mostly works.
As a side note, everything is a lot more responsive. Pages load much faster, there's no freezes while nothing appears to happen, scrolling is smoother, and links actually open where you want them to. Plus half the adverts have just disappeared.