I created some online vocabulary flashcards to study for the GRE Verbal section and they really helped me a lot (my verbal score went up 200 points to the 99% percentile). Since it took me so much time to make them, I figured I would make them "public" and I thought you all might find them useful.
http://www.thekatesp....com/dictionary
There are two versions of the flashcards: public and personal. Anyone is allowed to use the public version, and the flashcards will test you on some of the most common vocabulary words found on the GRE Verbal test. In the (free!) personal version, you have the ability to create and save your own mnemonics, example sentences, connotations and synonym/antonym lists. All the features are listed on the features page and you can create your (free!) account on the registration page.
There are almost 600 words in the database, which I got from the two books I bought for my test prep. I want to add more words and add more features, but it would be great to get feedback from users first. I'm just doing this in my spare time (which I now have, now that my grad applications are submitted!) and this is just a beta version, but I'll try to do what I can as far as "user support," etc.
Hopefully some of you might find it useful!