Personally, I use a Motive Power Bleeder model 0100 but here are links
to 3 different homemade power bleeders for those who are considering
making one:

http://scirocco.dhs.org/cheapassron/CheapassPressureBleeder/index.html

http://www.bmw-m.net/TechProc/bleeder.htm

http://bworks.net/vw/bleeder/info.htm

Mike