Yeah .. rooted mine and have quite a few hacks -- from enabling "tethering" over BT PAN using ssh tunneling, to enabling hidden features (call duration, extra launcher pages) to CPU overclocking and scaling. If you're not comfortable with a Unix/Linux command line environment, my recommendation is don't do it. This phone has taken over my life already. I need a cure for Pre addiction.
<a href="http://s16.photobucket.com/albums/b5/middle_man_/?action=view¤t=5064_96783253510_8389383510_2081632.jpg" target="_blank"><img src="http://i16.photobucket.com/albums/b5/middle_man_/5064_96783253510_8389383510_2081632.jpg" border="0" alt="palm pre ad"></a> http://www.engadget.com/2009/06/26/sprint-takes-a-bite-out-of-the-apple-touts-innovative-pre-featu/
I don't know about the phone, but I sure as hell wish I had bought that stock in December. From about $1 - $16 in 7 months. Silly.