Just tried the gadget from my iPad and it works. I was able to check email and add to activities.
I would imagine that this would work on any tablet. I did have to switch from gmail mobile to desktop.
Great to hear that it's a viable alernative.
Shame, however, that it doesn't work on the mobile optimized version - it obviously gives a better experience on a tablet or phone. But, alas, our hands are tied until Google implements it.
Paul