If you are worried about the Raiders not having a second, third and fourth round pick next year, don't.The Raiders will get compensatory picks for all that they've lost in rounds 3-7, depending on their worth.
This isn't official but I think the Raiders will definitely get a third round pick for the loss of Nnamdi Asomugha. He is the best corner in the NFL, he had a salary of over $10 million, and he's a former first round pick.
Zach Miller didn't have a big salary until he bolted for Seattle but he was a Pro Bowler in 2010. He was a second round pick too so his compensation level should be a third but or least a fourth round pick in 2012.
Then there's Gallery, who was a bust at left tackle but had a hefty salary and was a first round pick. I'm thinking that this could very well be a third round pick to but has to be at least a four too.
I'm not sure how much is draft status, salary, or performance but there is potential to get tree thirds here. Two thirds and a fourth could happen to but it looks more like a third and two fourth.
Three third round picks would be lovely but I don't think the NFL will do that.
Again, speculation on my part.