Oops. I forgot to mention my thoughts on MDict.
Itt's fast, it's got lots of potential, and it has a good choice of dictionaries
(plus there are some tools on the website for making your own
). Better yet, it's free. It's just missing a few of the contextual and semantic doodads that Lextionary offers. In any case, I'm happily using both.
Now, if only someone could port the downloadable Wikipedia to MDict
(like they have with Tomeraider
)...