Maybe I'm the last to know, but I found out that Goodreads will do a giveaway of an author's ARCs for free. I offered some copies of HER HIGHNESS' FIRST MURDER and got a great response. Goodreads lets you choose how many books you'll give away, decide how long the contest will run, and enter the information you want people to read. They choose the winners, send you their mailing addresses, and you mail them the books. It's a pretty painless process, and the first day I was listed I had 176 responses. Good use of an ARC, IMHO.