I've got one of these
http://www.speedbleeder.com 
fitted to each caliper now, makes bleeding a breeze
But for the rear, I also unbolt the caliper from it's mount and move it to the top of the disc, so that the pads still press against the disc but the nipple is then the highest point of the system. Leave it for 5 mins or so for the bubbles to rise, bleed the system, then put the caliper back in it's correct position.
[Edited on 25-7-2004 by Mr_S]