Apple has a buy-back offer now and then when they offer a new product. They are buying back iPhones right now, but AFAIK not iPads. You could approach the folks at the Apple store, but my guess is that although they generally bend over backwards to take care of folks, their return policy doesn't extend to six weeks so they may not be able to give you a break. You could try to see if they'll allow it with a hefty restocking fee.
I love my iPad, but I get where your wife is coming from...not so much about Flash as I really don't miss it, but versatility. You might want to have another look at the 11" Macbook Air. I bought mine the day it came out and can't imagine not having it. I looked closely at the 13" MBA but couldn't get past the terrific size and how light the 11" is...not a lot bigger or heavier than the iPad (not to mention the price difference...although I upgraded everything so my 11" MBA came out to be about the same as the base 13").
With Lion's full-screen viewing and the awesome screen resolution the 11" MBA is really very hard to beat at $999 (looks like Best Buy and B&H Photo have it for $939). You could also consider a refurb...they carry the same one-year warranty and are eligible for Apple Care which extends the warranty to three years.
Refurbished MacBook Air 1.4 GHz Intel Core 2 Duo - Apple Store (U.S.)
One of the great benefits of Apple products is that they hold their value quite well. You should be able to sell your iPad on Craigslist or ebay for a pretty good price if that's what you decide to do.
Best of luck and let us know how it goes!