Blitzkrieg Wargaming Club
In here one can find ladders and PBEM opponents for a number of great wargames as Steel Panthers (all the versions), Combat Mission and Operational Art of War. Every game has it's own ladder and message-board where player can easily find an opponent that match his/her own skills and read interesting stuff about various details about the games. In Blitz one can also find lots of stuff to download and a community of similat-minded gamers. A place that everyone involved with wargames feels home.

Shrapnelcommunity WinSPMBT Forum
In here the fathers of WinSPMBT join the discussion with the players with fruitful results. Forum has all the latest developments in paches and new versions and lots of maps, scenarios and custom OOB's created by players. Every possible bug and problem is covered here and if not, just post it and you'll be helped. Many interesting topics and discussions about WinSPMBT can be found. Bad thing is that the forum has lost lots of the activity during lasts months. But still a place every WinSPMBT-player should check every once in a while.

Strategy Online's Steel Panthers forum
Another forum, this one covers all the games in Steel Panthers -family. Haven't really been here often as I only play SPMBT, but the things I've read have been interesting.

SP:WaW Depot
A site that covers Steel Panthers World at War -version of the game. Lots of stuff including interesting forum.

WinSPMBT Downloads
WinSPMBT and it's latest patches are available for download here. They're all free but player has the option to support the great job these guys have done and buy the purchase-version which includes some cherries not found in the free version, including 250 PBEM slots.