I'm playing a Wizard/Fighter/Rogue/Spellsword build myself at the moment and I'm quite enjoying it. You can find the build I'm using here
if you're so inclined. While certainly not the most optimized (especially with the playstyle given that I'm not using polymorph), it really doesn't need to be any more optimized unless you are running around with optimized CoDzillas/Shadowcraft Mages or the like.
Basic idea is a trapfinding, selfbuffing tank - full caster levels and not much BaB loss. The build has been continually tweaked based on gameplay, notably with the Leadership and Might Makes Right feats. That and he recently started worshipping Boccob which prompted Knowledge Devotion.