I can't tell by your post if you got it off or not, so I'll reply anyway.
Most of the time there are little plastic clips that go through holes on two corners of the chip, which hold the cooler on. Some are just held in with thermal adhesive, it depends on the motherboard/cooler design.
If you have clips, you'll need to take the motherboard out and flip it over, and then push the clips out. It should come right off then, and if it doesn't just twist it a bit.
For the adhesive type, just twist and pull it. I very much doubt you'll pull the chip out, since it's permanently attached. If it doesn't come off, then go do some stress testing to heat it up, and then shut down and quickly remove it.
Intel Q9400 | Gigabyte EP45-UD3P | G.Skill 2x2GB DDR2 1000 | XFX HD5870
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