I'd love to have 'asynchronous' node voting. It's annoying to have to click each node you want to vote on, scroll to the bottom, then click 'Vote' (sometimes I forget to actually submit the form when reading a long thread).

That's a great idea, and easy to implement in a well degrading way. Add a button and a small iframe next to the voting buttons, and make that load the reputation display when the user has voted. Some Javascript could be used to hide the vote buttons (don't put THOSE in the frame!), but it would still work well without.

Things like this I started using years ago, before anyone had invented the name AJAX for it, and long before XML and Javascript were considered required for something to be cool.