Although Googling takes this back to at least http://www.gamiko.co.uk/showthread.php?t=4043 and the Chinese author's http://ipvideo.512j.com/bbs/bmb/topic.php?filename=216 linked in the application appears dead, I don't see this in our PS3 Downloads section yet so here goes, from the source link above:
A Chinese programmer has put together a PS3 controller driver that works with standard USB HID. That driver is called SixAxisDriver, and you can grab it right http://www.hardcoreware.net/files/sixaxisdriver.rar. Simply run the install, load the driver, reboot Vista, and your controller will be identified and will start working!
This is good news I guess, but I myself already have one of those previous drivers installed .. This would've been an exceptionally good, ground-breaking news, if this driver supported the PS3 controller's bluetooth connection, hence meaning no wires even when using the controller with a PC.