I am interested in mashups, but am probably not as hard-core as the other attendees will be. I'm sure there are ways to make our library catalog more useful by combining it with tools like Baker & Taylor, Amazon, Delicious Library, LibraryThing, Library Elf, and more, if I just had the time to sit and think and experiment. We'll see.
Another nice feature of MashupCamp 2007 is Mashup University, which is "specifically geared towards hands-on training whereby new and experienced mashup developers can get classroom style instruction on how to build mashups." Now that's for me.