Let's Talk Ipads and Photography

I got an ipad last summer, and it makes my life easier in many ways.  I use it to quickly check my email and scan the internet.  I love it for watching Grey's Anatomy and Modern Family on ABC Player and a ton of different streaming videos on Netflix.  Of course, I use it to read books, too.
Recently, I've also been exploring its uses for photography.  I got the camera adapter as a Christmas present, and I use the ipad to review pictures and decide which ones to delete from my memory card.  This is particularly useful when I'm doing photo shoots for the school sports teams.  I take 10-12 shots of the team.  On the ipad I can quickly and easily compare them and decide which 1 or 2 to upload to my computer.  I have also used it in a photo walk class to do a critique session.  The display is so large and bright that it's the perfect way for 3 or 4 people to really look at the same image.
And now, I discover that there's all kinds of cool photo editing apps for the ipad!  There's a great review of a bunch of them at this site.  I installed the free one called PhotoPad by Zagg, and had some fun playing with it.
I took the daffodil picture above and easily created these two images:

Kindof fun, huh?  In a more realistic vein, I took this sports portrait:

Did a little photo editing (removed red eye and adjusted some cropping and color) and then turned it to sepia to get this photo, which his mother really loved:

I've been very happy with this as a free app, and I'm considering some of the paid photo editing apps recommended in the article.  I'm curious about whether any of you have used them and what you think of them.  There's also this article on ipad photo effects, rather than photo editing.  They're all paid apps, but I'm considering "Camera Bag" (a filter app that looks to be kindof hipstamatic like) for $2.99; Color Splash (turns the picture black & white and then you go back in to add color in selected areas) for $1.99; and FX Photo Studio HD (which seems to be almost more of a photo editor than effects-adder) for $2.99.  I know that these duplicate some of what you can do in PSE or photoshop, but the advantage seems to be in portability (I can do this all without a computer) and in ease of use.  Again, I'm curious as to whether you've tried any of these and what your take is on them.  And whether you have used an ipad in your photography in any other ways.
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