Just googled for Vista TCP Limit on behalf of FlashGot user.
The first 500 results at least are all reported as malicious sites, including the top two, Softpedia and MSFN.
Luckily enough for P2P addicts, Firefox’s Safe Browsing — even if backed by Google’s data — doesn’t seem to agree ;)
Update Sat Jan 31 2009 16:32:50 GMT+0100
Looks like it was a more general Google bug, fixed now.