Updates to Garry's Mod have been released. The updates will be applied automatically when your Steam client is restarted. The specific changes include:
Garry's Mod
Fingerposer now works with TF2 models
Improved fingerposer UI accuracy
Added GUI Skin chooser
Added content mount chooser
Added code to fix TF2 turrets spawning with unusable physics object
Restricted content mounted by default
Various player model fixes (Thanks to Nickolas George)