I just learned about C-c C-b, bound to erc-iswitchb in ERC (in Emacs), which pops up an iswitchb buffer-switching prompt that presents only ERC buffers as options. Very handy!
If you're not using iswitchb-mode, you might want to check it out. It's hard to explain the interface until you see it, but basically you can switch between buffers by typing only a couple letters from a buffer's name, and you can also cycle through the names that match the pattern you've typed so far.
