Software : Kaplan GMAT/GRE/LSAT 2006 Platinum (PC)

Rating: - Worked Well for Me!
Although I purchased several study aids, including Kaplan GRE Exam in a Box (which I also recommend), this little software package became my primary study tool.
My test prep was focused on the GRE. When I first installed the software and started poking around, the graphics seemed a little too "cutesy". But then I took the initial diagnostic exam, and was given approximate baseline scores which seemed quite reasonable (given that my high school math is about 30 years in the past, and I had done exactly no preparation).
Once the diagnostic is complete, the program builds a study program for you, which you can work through it at your own pace. That helped a great deal. The lessons brought back lots of old knowledge, and provided some shortcuts as well.
The program also includes computer-based flashcards and games that will help improve your ability to quickly respond to questions.
Bottom line: If you can get past the sometimes-hokey presentation, this is one of the best study aids available. My score didn't increase by 100. It increased by almost 300. A great tool!

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Rating: - Improved my score by 120 points.
The reason I recommend this CD is the practice tests and the vocabulary builder. When I took the GRE the first time I had reviewed my math and practiced my vocab, but I was not used to doing the problems in a strict time limited environment. This CD has practice tests that mock the real GRE, so you can get used to working under a time limit, and answering the questions on a computer. The vocabulary builder was a real help too. It is a game where you try to match the words with their definitions in a limited amount of time. The only problem I have with this software is it comes off alittle cheesy and childish when you do some of the lessons. Other than that, its worth using.