Need to be careful with hotspot access. Most of them if not all of them 'hijack' your first use of internet explorer with the vendors home page to log in with your account or choose a partner account login (like using a BT account on a t-Mobile hotspot).
Now this is fine for Web Browsing, for email only it can be a pain, have to get a browser session working first then you can use a mail client, i have this issue with my PDA in hotspots.
My point being this, with a Wifi/skype type phone, how will you be able to convince your hotspot that you can use it. You can probably set your wifi credentials on the Phone but the trouble will be trying to use these credentials on a partner hotspot, eg BT login on Tmobile.
So i suppose it will work but probably only for one vendor of hotspot, BT openzone in all MacDonalds, T mobile i think is Starbucks.....
I don't profess to know the answer but thought i would offer what i know from using them, Travel Inns are a 8itch cos they use some funny Swiss based vendor with no partner to anybody useful!!!!!!!!!
I would love to know if it works though as i do VOIP for a living.....NERD!!!!