I recently replaced my 2000ma LiPo USB battery with a 10000ma model that's about twice the size. It also can recharge my iPad, which the smaller battery could not do.

Being able to cache Google Maps would be an outstanding change for iPhone and iPad.

I've really liked iTopomaps but recently it's had some stability problems. Hopefully those will be resolved soon. I like what I'm seeing in MotionX, and at the price I plan to try it soon.

As much as I love my gadgetry, I don't go into wild places without a paper map and a compass. I'll fire up my GPS and drop a waypoint for sure, but after that I usually turn it off.