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Thanks for all of the help guys.

I ended up reformatting my internal HD. It appears to be working fine again. I've installed Snow Leopard and DP7 and everything seems to be happy again.

I love that DP app for my iPhone! That thing is the coolest!

I have had this exact issue. Neither Disk Warrior nor Tech Tool were any help. Only erasing and re-formatting did the trick.

Apple's Disk Utility, when asked to zero all data on an erase, will re-map any bad sectors it finds. If this was an anomaly, you won't see it again. If the problem re-occurs, replace the drive.