Well... I got my iPad last night. I actually waited in line, first time I've ever done that for anything - But since I went to Best Buy instead of the Apple Store right across the parking lot, I was about 8th in line and had no problem walking out with my desired 64GB WiFi+3G iPad.
Today, I got to fly with it. I have ForeFlight HD installed (first app I downloaded). Very slick - And since I had opened ForeFlight prior to leaving the ground, and didn't use anything else, I got a nice accurate location on the VFR and IFR low enroute charts. Worked so well I started wishing the plates were georeferenced.
The screen should not be an issue with a yoke mount. For some people, if they have it on their thigh so it's reflecting sky from the front windscreen, it might be more difficult to read, but that's what I was doing and it's quite possible. I was also able to read an approach plate just fine outside the airplane where it was bright and sunny.
One tip: The little switch next to the volume buttons locks the orientation. If you're going to fly an approach, lock it in portrait mode, especially because ForeFlight seems to have a bug (which I reported) that results in a display oddity if you switch orientations while looking at an approach plate. I'm sure they'll have it fixed soon, but I don't know why you'd ever want to look at a plate in landscape mode, so I think the tip will still apply.
As far as battery life, it's flat-out stupendous. 13 hours, 23 minutes to kill it today. Wow! I was even trying to kill it at the end - I started playing The Matrix at the lobby scene when the battery hit 10%, figuring that'd kill it by the end of the scene. I finished the movie and still had 5% left over, so I flew around in the F-22 Raptor in X-Plane for a while to finish it off.
I plugged it in about 3.5 hours ago and it's back up to 90%, so it should be easily usable in an airplane without having to use external power even if you have several legs to fly.
The screen is purty. I was playing One Six Right on it today too, and the flight scenes look great!
As far as issues: I had some sync problems last night - The second time I synced it, it uninstalled all my apps for some reason, and then it installed them all again on the 3rd sync. (I hear there's a new version of iTunes, 9.1.1, that's supposed to make things better.) A lot of things seem like they were a bit rushed to market - For example, ForeFlight doesn't have all the features on the iPad that it has on the iPhone - But that's mainly because developers had VERY little time between receiving the SDK and the deadline for having their apps submitted to be in the store on day 1, so I think there will be a lot of improvement in short order.
With that in mind - It's not perfect yet, but it's gonna be a lot closer in about 6 months, IMHO. It's good enough to be worthwhile now, especially as an EFB, but there are still some things (like lack of printing support - especially on a platform with a word processor!) that I think are going to be fixed right around the corner.
At least everything that's there seems to work very well - So I guess "fixed" is maybe the wrong word. Nothing's "broken," just more like "missing." Printing, document sync with the cloud for the productivity apps, features in some of the third-party apps, etc. But what it is today is still very drool-worthy.
Oh... And it's a chick magnet.