http://openocd.berlios.de/web/- official site of the OpenOCD project, you can find the most up to date version of OpenOCD here, but you will have to build it yourselfm, aslo the full user's manual is here
http://www.yagarto.de/- home of YAGARTO (Yet Another GNU ARM Toolchain). i.e. GCC compiler and bin utilities for Windows
Olimex's ARM GCC for Windows Dummiesinstall CD - installs on your computer GCC + OpenOCD debugger + Eclipse for out of the box development with the open source GNU C compiler and OpenOCD debugger, supports flash loading with make examples for different ARM controllers. The current revision of the CD is 8.2 REV.I check the CDreadme.txtandrevision history
For the moment the only supported package is GCC C compiler + openOCD debugger + Eclipse IDE. Olimex can provide the necessary information and cooperate with interested parties if they want to add low cost USB debugger support to their C compilers and IDEs.