We certainly do! You can access the PinnacleCart-run forums here. You can post topics or questions, answer questions, leave comments, etc. Be aware, you must be signed into your account in order to post.
There are also community-run forums out there as well. For example, www.forumpinnaclecart.com is an active community of PinnacleCart users and developers. Be aware that third part forums do not have any oversight by PinnacleCart or it's employees.