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
Added 'Player List' option to menu screen
View is no longer limited on Prisoner Pod
Added chair vehicles
Fixed 'laggy' motion blur on listen server (Thanks HLCoders)
Fixed various playermodel issues (Nova)
Fixed HL2 maps not being mounted
Fixed content choices not being saved on some systems
Fixed always adding the "increased_maxplayers" custom server tag