1. Donate half to libraries, universities, and museums.
2. Give some money to Kovid Goyal and other developers.
3. Buy all the books at Amazon, B&N, etc.
4. Hire someone to organize my collection and to read to me.
5. Get a job at the Salvation Army. (Why? Less stress, and first dibs at the bargains).
6. Travel the world to see all the places I've only seen in books.