The new version of GovConTrack was just approved for the app store! I’ll be updating the website tonight: www.saygoodnight.com/govcontrack
The big new feature is the ability to query USASpending.gov, for both detail searches and summary searches with graph & top 10 data. Of course you can also search FPDS-NG as well. For looking up government contract awards on iOS devices, there is no better app!