We are currently demoing a Palm Pre. Today we succeeded in "rooting" it (gaining Unix administrator control) and enabling it into a wifi router. It is still a hack, and not completely reliable and usable, but good enough to get the job done. (In the course of writing this post, the connection dropped, and we chose to switch to a more reliable connection.) The connection seems unrestricted by port and protocol so that VPN, Remote Desktop, Bit Torrent etc all seems to work on it. With Palm Pre which in USA is on the Sprint network, speed seems to be 1 Mb/s down, 0.15 Mb/s up.
Here are the directions to enable the WiFi router most easily. With root access, one can change many settings with a bit of determination.
The Pre itself is adequate as a phone and web browser. We are still not sure if we will keep it or abort it, as Bruno would say. Sprint allows 30 days to return it. Waiting for a proper Android on a proper network or submitting to the tyranny of Apple ATT are the only other options to remain a functional mobile Internaut. All choices require a 2 year lock in.
Update: Given new moves to block tethering, ATT/IPhone is a completely nonviable option.