I thought it would be interesting to see which forums are being used and what you like about each one.
I'll start off.
I like this forum the best since it is fairly active with a large number of new posts each day. Also, the people posting here are knowledgeable and helpful. I also like how easy this forum is to use especially the ability to view only active topics.
I also use PTE forums:
http://ptenthusiasts.org/
This forum was recently upgraded (downgraded) so it is running slow. There is a lot of activity here but much of it is just chit chat.
A also use the PTCC forum:
http://www.ptcruiserclub.org/
I like this forum. It runs fast and it is easy to negotiate. It is not a very active forum however.
The winner in my opinion is the PT CRUISER LINKS.COM FORUM.