I just played with it briefly on my Pocket PC Phone, and it was very slick. The thing that stood out to me the most was the speed – even accounting for the fact that I’m on speedy EVDO, the pages loaded very quickly. The interface is very simple, and most functionality (stars, adding recipients from your Contacts, etc.) appear to be available, and easy to find.
Apparently, you’re supposed to be able to call back straight to your Contacts that have phone numbers stored for them. I don’t have any phone numbers in my GMail contacts, but I’ll definitely have to check that out.
It still doesn’t do anything to notify you when you’ve got new mail (but that’s what POP3 access is for, right?), but besides that, it gives you pretty much full control of your GMail from your wireless mobile device or cell phone. Thanks, Google!
I’ll post some screenshots and more impressions after I’ve played with it some more. Maybe even an audio or video podcast review, if warranted. Stay tuned.