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Wiktionary is great, but these days I'm only interested in the "Translingual" and "Japanese" sections of a page. It would be really nice if I could set some option to only show these unless I explicitly ask for the Cantonese, Mandarin, Korean, etc., sections. (I guess I should figure out Greasemonkey again.)
Also, it makes a fantastic reference, once you get to the character you're looking for, but the search doesn't really work for kanji: you can't search by stroke count or radical (or if you can, I can't find it). I usually go to  to look up the character. I'd rather have the additional information that Wiktionary has, but it's a pain to search for kanji here, and usually Saiga ends up being just good enough. So I use Wiktionary if I find a character on the web I don't know, and I use Saiga if I see something in real life I don't know, because Wiktionary has better content (usually) but Saiga has much better search. But it seems like something that would be relatively easy to improve. (Maybe I'll take a crack at it...)