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I use Foreflight on my iPad, and like it alot, although I've only used it VFR since I don't have my Instrument rating yet.
You could pull the charts down in PDF and use something like Goodreader or the upcoming version of iBooks to view them, but that seems a bit painful. You're then swapping out potentially quite a few PDF files every 28 days (assuming approach charts for IFR) vs letting an app take care of tracking chart expiration for you.
Foreflight's out for iPad, WingX has announced for iPad, and the Flight Guide folks were demo'ing an interesting beta at Sun 'n Fun back in April, supposed to be out soonish.
Up in the air, the 3G model's GPS is decent, but not great, especially since you can't relocate the GPS receiver for a better view of the sky (This might only be an issue for high-wing aircraft like what I fly currently). You don't need to have Cellular Data turned on to use the GPS. There is a slight glare issue, but it can be worked around with either shifting the iPad around a bit or anti-reflective screen protectors.
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