Defining estimates of the size of contracts, size of markets, of course is extremely difficult and highly speculative, given the way the money was allocated. If you look at the recovery act, the funding is allocated through various programs and then each department will manage those programs. It's then transferred on--sometimes kept at their level, sometimes transferred on to sub-federal level. If you look at the amounts in the act, it's very difficult to estimate the size of contracts, because it will depend on how the departments manage the funding.
In addition, as you know, the U.S. has a website called Recovery.gov, which reports on funding allocation and all that. If you look at that website, you'll see what it reports, really, are the transfers from the federal level to the sub-federal level, but not actual contract information.