While I'm on the road, I use my laptop vigorously. I choose hotels based on their WiFi coverage and inclusiveness. This trip, I noticed my email from my corporate server can be downloaded, but not sent. Why? My IT guy reports that many WiFi ISP's block port 25, to prevent spammers from "wardriving," finding a free hotspot, and blasting away. So, thanks to Palm, Bluetooth, and my Treo, I wired up to my Treo 680 as it's own Bluetooth hotspot. Sure, it's no WiFi, but my mail gets out.
Damn, that was easy.