Dean Edwards has built a really nice JavaScript library intended (maybe not intended? I'm not too sure what the bigger picture here is) to fix and expand on the current DOM where needed. What's most exciting here is the implementation of the DOM Level 3 Core Selectors API. It's only 20kb when compressed so definitely worth using, and has none of that fancy shit that other libraries do (don't know why, but I just don't like it all. reminds me of <blink>).