Version 1.2.10 of GtkRadiant is available! This version offers support for Soldier of Fortune 2 and various improvements/bug fixes to the games already supported. Get it here.
While you're here, you may as well get Quake 3 Arena Shader Editor (Q3ASE) which is now at version 1.5. Enhancements include:
? RoQ video playback supported
? Much improved ActiveX support
? Realtime self-shadowing stencil shadows for MD3s (needs 32bpp desktop)
Download it here.