This is a great website from Senator Tom Coburn of Oklahoma that has a ton of reports on Federal waste

Senator Tom Coburn, M.D.

Here are a Some Examples:

Stimulus Checkup: A Closer Look at 100 Projects Funded by The American Recovery and Reinvestment Act

100 Stimulus Projects: A Second Opinion

Out of Gas: Congress Raids the Highway Trust Fund for Pet Projects While Bridges and Roads Crumble

2008: Worst Waste of the Year