After a hugely successful launch my site was promptly sacked by Google. My PR went to 0 and soon the title of my site (also my domain name) could only be found on the 3rd or 4th page of results. As a result I removed all links to my main site from the sacked site and pulled all the redirects from my main site to the sacked site. I had some big sites that were lost in a server crash and I had been forwarding all their traffic to the sacked site. Those sites no longer redirect and have been rebuilt. Recently my PR went up to 4 which is what I expected it to be and now my Ad Co-op points went up from 2 to over 1300. Does that mean my site is out of the sandbox and ready to play with the big kids again?
something like that ... but please 2-3 more months , because some datacenters will percep you still on sandbox