USB Upgrade
"Sell it and buy a new one." Wow.
I love my PB Titanium, and it's only a 500MhZ. I did upgrade the ram and added a 250 GB HD, but the usb ports don't bother me.
You didn't say which model you own, but you also have the FW option.
Perhaps you don't truly need usb 2.0, everything I have works fine and the loss of speed is not really noticeable.
If you need the speed and I guess if you have the means - why not trash a perfectly good machine and buy a new one?
I did come across a usb replacement once - if I find it again, I'll let you know!