Can you search for all posts you've upvoted?
I have an ulterior motive for this, but it does seem like a useful function in general. I didn't see upvotes under "Recent forum activity" or elsewhere but maybe I'm missing something.
The ulterior motive is that I've trying to use 'u' to go 'up' to the thread list like in gmail, groups, etc. It doesn't work, but I just realized what was happening to all those 'u's (and that I should be using 'f' instead)... but who knows what I've upvoted!