Troy Dean did a great presentation at WordCamp Melbourne (which I was supposed to be at but missed ) on how to charge more for your work. I think I may have even posted about this before, but I came across it again and still feel it's worth checking out.
I sure do! And if you do too, I'd recommend checking out James Dalman's talk, "Making Six Figures in Web Design." http://s0.videopress.com/player.swf?v=1.03 He also has some pretty cool video series on his web site. Great stuff James!