Found some really cool resources for devleoping applications for these services:
Blogger.com:
http://www.blogger.com/developers/api/1_docs/
Google.com:
Amazon.com:
http://www.amazon.com/gp/browse.html/103-2952669-8856635?%5Fencoding=UTF8&node=3435361
Ebay.com:
http://developer.ebay.com/DevProgram/developer/api.asp
Check it out.