Check Point VPN-1/FireWall-1

https://supportcenter.checkpoint.com/supportcenter/index.jsp
Secure knowledge base maintained by Check Point. Good advices for searched key words. Requires Java Script and Username/Password for advanced access.

https://forums.checkpoint.com/forums/index.jspa
Forum about Check Point products, maintained by Check Point. Requires Java Script and Username/Password for joining. Some "nice features" like collecting points for answering a question with a "correct" or "helpful" answer - not kidding.

http://sofaware.infopop.cc/6/ubb.x
The SofaWare Discussion Group with Announcements, problems and solutions. Requires Java Script.

http://www.cpug.org/forums/
Dameon D. Welch-Abernathy, aka Phoneboy, has moved his well known site for FAQ's about the Check Point products to the Check Point User Group (CPUG). It's forum based. 

http://www.tek-tips.com/threadminder.cfm?pid=32
The Tek-Tips forum discusses some problems about Check Point and related topics (e.g. Nokia, VoIP with Cisco)

http://www.attackprevention.com/Firewalls/Checkpoint
AP provides information about Check Point NG and some good documents about Nokia IPSO.

http://www.deathstar.ch/security/fw1/
Obiwankenobi's FAQ's, good and well sorted information about all topics of Check Point NG.
(outdated, latest information from 2002)

http://www.tla.ch/TLA/FW/FW1FAQ.html
Some information about Check Point, including survey of some possible vulnerabilities given by Telecom and Logistic Associates.
(outdated, latest information from 2007)

http://www.dreamwvr.com/bastions/FW1_faq.html
Site with some FAQ's, covering version 3.x and 4.x. Good link collection in the Unix-section, where to get updates for Unix. 
(absolutely outdated)

- non english sites -

http://www.clico.pl/html/esupport.html
Not too many, but good documents about Check Point, also SofaWare, in Polish

http://support.intellect.com.tr/
Here you find some information about Check Point Next Generation in Turkish. 
(currently not reachable, May 2010)

http://www.checkpoint.com/services/mailing.html
Mailing list maintained by Check Point. Good resource, many subscribers (so also much information). Mails have [FW1] at the start of subject, so sorting these mails in a separate folder is easy.

http://fw1-gurus.phoneboy.com/
A moderated mailing list which has been closed the 1st of May, 2009. Good information, no "test"-mails and also covering the "how to" around Check Point VPN-1/FireWall-1. Due to moderation sometimes not as fast as the list by Check Point. Mails have [fw1-gurus] at the start of subject, so easy to sort. 

http://fw1-gurus.phoneboy.com/archive/
At the bottom of this page you find the archive of [fw1-gurus].

http://www.mail-archive.com/
Search for fw-1-mailinglist and find all postings of Check Point's [FW-1] mailing list.

http://marc.theaimsgroup.com/
Here an archive of several mailing lists can be found, [FW-1] and [fw1-gurus] in the section Information Security.

http://www.checkpoint-ug.de/
Check Point User Group located in Germany. Discussion Boards and hints for certification - in German