Just thought I would let the community know that there is a new GMAT preparation application for the iPhone. It's called "TestPundit iGMAT". It's pretty cool as it has lots of new practice question, review topics. I tried it and liked it a lot. Although some UI changes are needed to make it prettier, but the content is pretty good.

I found it while scrolling through the "Education" category on my iPhone App Store link. I think you can also search for "testpundit" or "igmat" on your iPhone App Store to find it.