Not too long ago, Microsoft remade the classic Windows 95 game "Hover!" using WebGL. You can find it here: http://hover.ie/
If you want it to look like the original version, just type "bambi" on the first screen, and it'll bring you to a fake Win95-esque desktop with the game running in a window in the middle, with the original graphics and sounds. It's not entirely glitch-free though, as I managed to get myself stuck in the stairs. XD
For extra nostalgia, here's Weezer's "Buddy Holly" video, which was also featured on the Windows 95 CD:
[youtube]http://www.youtube.com/watch?v=kemivUKb4f4[/youtube]