I have gotten myself onto the roster for the 2011 running of Trans-Iowa. With 300+ miles of gravel and "B-roads" in the Spring of the year, this will likely be the toughest thing I've ever attempted on a bicycle. Here's a photo I took while volunteering for last year's TI.
I have a lot to do to prepare myself for this in the next 6 months or so. Physical conditioning is one thing, and I know how to do that, but I figure at least 90% of TI is half-mental.