I was just just updating some of my Amazon associates links and noticed that Amy Jo Kim’s Community Building on the Web: Secret Strategies for Successful Online Communities, which is now out of print, is being offered second hand for between £80 and £95! That makes it easily the most valuable book I own. I wonder if there will be a reprint or update soon of this popular "bible" for online community builders?
[Not only do I make book recommendations – you might look at this blog as a good source of investment advice. ;-)]