Navagon: You might get more gameplay tips from the Spellforce forum, but I've got no idea how active it is.
As of a year ago, not very. However, the search function was my friend; pretty much everything has been covered already. It helped me build my character as well as find tips for certain maps.
EDIT:
Uh, duh. You probably meant the Spellforce forum at GOG. I read it as meaning the
Official Spellforce Forum.
The forum here at GOG was not very helpful to me, but I bought Spellforce Platinum in the first week it was offered at GOG. Perhaps now it is a little better. I would still search through the Official forums though, it was a great help to me.