Just an update to everyone who helped me think about this question: the prints are in transit and will arrive at the gallery today! Unfortunately, I won't get to see them until August (the gallery is in Del Rio, TX, and I am in IL) when I can visit in the summer, but the support folks at Mpix were very helpful. Someone even offered to make sure to check the prints personally before they were shipped, so I have high hopes. You all helped me to rethink my post-processing, to look more closely at the the lens I used (16-35mmL--a great lens, but yes, even with a crop sensor the corner details are little muddy), to take the scary step of learning *something* about file conversion (not enough!), and to put "learn how to calibrate your monitor" on my to-do list. Thank you.
I'll give you a real update when I see the prints in person. The true success here is that the images exist in the real world now, for good or for bad.
I don't yet know how to load images that are an appropriate size for this site, so I'll leave a couple of links below to my blog where you might see one or two of the images I chose for the show, as I think someone asked to see some of my images. Please remember I'm a newbie--this show is small and I am still learning what a good image looks like!
Again: thank you all!
http://ghostword.blogspot.com/2010/02/blog-post_17.html
http://ghostword.blogspot.com/2010/02/blog-post_03.html
http://ghostword.blogspot.com/2010/02/blog-post_12.html