I really enjoyed watching the executive producers commentary on disks 2 and 3 or the 4 disk set of season 2. Even though the shows they are commenting on are season 2 episodes, they obviously recorded the commentary while shooting the finale for season 8. Several of their comments talk about how things have developed *since* season 2.
In fact, I found several of their comments revealing and relevant to several of *our* topics here in the newsgroup. I would highly recommend the set to any true "Friends" fans, or even to those who might be interested in a little more perspective from Bright, Kaufman and Crane.
(Of course, you also get the full season 2 set of expanded episodes.)