Wireless-G VoIP Phone (SIP) with internet browser on-board. Finally a standalone WiFi phone, with the capability to log-on at hotspots requiring a credit card. Sure - it isn't seamless. You still have to use pocket internet explorer, but at least it will work, and you don't have to get out the laptop.
If you're tied to Skype, I think the only option today is the Netgear phone, but this doesn't have the capability to log-in to a hot-spot. (Unless Skype broker some deals for free Skype access at hotspots, which I think I heard that they'd been doing. I wonder if this will work from the Netgear phone.)
Linksys.com - WIP330