(warning: conflict of interest)
My spouse, Leonard Richardson, is working on a new book for O'Reilly:
"RESTful Web APIs, a follow-up to 2007's RESTful Web Services". It'll
come out next year. Those of you who are interested in RESTful web API
design (paging Federico!) might want to sign up to be beta readers.
http://www.crummy.com/2012/12/21/1
Leonard also wants to hear about interesting or odd domain-specific data
standards and hypermedia formats.
--
Sumana Harihareswara
Engineering Community Manager
Wikimedia Foundation