I get the same thing for the last couple of days. I was trying a new rom and I have a lot of apps. After loading the new rom it started installing the apps but after some were done, the rest give me this error. I've tried everything on the phone and then loaded a different rom but I'm getting the same error now right away.
I've heard that it may have to do with amount you download from Market in a specific period, has anyone been able to confirm this?