A couple of days ago one of these appeared in the courier parcel. The SPV is a GSM phone running the Windows Smartphone software from Microsoft. Over five years in the making, in my opinion this thing is a darn good product. It synchronizes with my calendar, email, and contacts (I’ve got over 1300 contacts stored on it, most with multiple phone numbers and email addresses). It gives fast wireless internet access over the GPRS network. It takes photos, plays MP3 music and videos, and games. It’s the first generation fusion between PDA and cell phone.
My only real complaint is that the keys are too small.
Only available in Europe, unfortunately, although you might be able to find an "unlocked" phone on eBay.