Magoosh!

I signed up for Magoosh just two weeks before my test. I originally planned on using it just for the extra practice exams, but ended up using it for extra review on a few topics I hadn't worked with since grade school. The videos that they have are awesome - a bit slow and dry, maybe, but they definitely get to the key concepts.

The math tests were much easier than the Manhattan GMAT tests (which were harder than the real test), but it was still good practice for the real thing.

I didn't poke around too much in the verbal stuff, but from what I did see it didn't seem to be at the same level as the math section or the Manhattan GMAT verbal section.