Just tried it with my 1Ghz android phone.
* product category nav is great (and really fast!)
* super easy to find/add items to cart
but...
* view cart bounced me to the non-mobile UI
* checkout bounced me to the non-mobile UI
Worked great up to the point of actually placing the order. I could live w/o view cart, but a mobile version of the checkout UI would be something to provide. I suspect you'll lose a lot of mobile users at that critical point of actually placing the order.
If there is a mobile checkout UI, for some reason my Andriod 2.0 browser didn't show it. Maybe I have to login first (via a mobile friendty UI) to get the mobile UI at checkout time? I'll look for that...
Nope... didn't find a mobile friendly login UI.
I think you're real close. Finding items and adding them to the cart is a cakewalk. Missing mobile friendli'ness...
* login
* view cart (less important)
* checkout process