I looked into it briefly a few years ago as a possible upgrade for my G3 iBook. Eventually I decided I probably wouldn't get much use out of it (and then a little while later got my MacBook). I don't know if the situation has changed since, but back then there was barely a handful of IDE SSDs available in the US and Europe. Japan, however had a much better selection. The bang-for-buck there was greater and would probably easily compensate for the costs involved.