BTW, all of the big PlecoDict databases use 16 KB records, so the widely-reported problems with databases being much much bigger on the T650 than on other devices should not be too noticeable with PlecoDict - flashcard lists might be marginally bigger, and there might be some inflation in the application program and the handwriting recognition data files, but in general the file sizes shouldn't grow by that much. (of course I can't confirm this since I don't have a 650 to test on yet)
Same goes for the problems with some programs being incredibly slow or not being able to load all of their databases into RAM - our memory management system is quite sparing about record accesses and should be relatively immune to such difficulties.
But if anyone reading this is considering the purchase of a Treo 650 I'd recommend you wait for at least a few weeks, not only for the sake of PlecoDict but also because of these other memory problems and program incompatibilities - hopefully palmOne will be able to fix a lot of them in a firmware update.