Lucky thing, too... my teammate on our initial assignment there is still on that same contract, 6 years later... getting annual raises and the odd promotion here and there.. still doing nothing. He still gets that panicky look in his eyes and starts rambling on nonsensically when you ask him what exactly he does there. He was a lot better at pretending to be busy than I was, and wasn't as gung-ho about wanting to be let go if they couldn't find anything useful or challenging for him to do than I was.
Took a year for my productivity levels to bounce back after leaving that project. Was just really hard to do any work for a while... 2 years of nothing makes you quite lethargic being used to napping and web-surfing all day. Took me all day to answer the 1 email or so I'd get in the morning. Most productive things I did then were read classic literature and hone my chess skills against the computer. I play a mean game of chess vs. computer these days because of my time with the DoD.