Squid-2.6 feature list

Andres' chunked memory pools allocator
Henrik's external ACL helpers
Some of Adrian's storage manager changes
Robert/Henrik's external log helpers
Allow pre-parsing to be performed in real-time
Log directly to SQL databases

Even better NTLM authentication support
Using Samba's winbindd

Adrian's runtime peer control
Enable/disable peers from external scripts
Control peer weights from external scripts