Duane/Alex and the gang have released Squid-3.0.PRE7. Its shaping up to be a pretty good release. If you’re running Squid-3.0 or you’re interested in helping out testing the release then please visit here to download.
I’m not sure what exactly has been improved since PRE6 but they’ve been busy trying to track down and fix all the bugs they can. Alex has been committing chunks to improve the ICAP support quite significantly. Amos has also been doing more IPv6 work in his branch, which will hopefully be merged post Squid-3.0.STABLE1.