This post is for audience who is starting their journey with Oracle B2B 11g practice. Thought of writing this article as even i wondered as to what to do where to search while i was like you. Hope this material will help you to understand Oracle B2B closely:

Oracle B2B OTN :
http://www.oracle.com/technology/products/soa/b2b/index.html

Download Location:
http://www.oracle.com/technology/products/soa/soasuite/collateral/downloads.html#11.1.1.3.0

Installation Guide:
http://download.oracle.com/docs/cd/E14571_01/doc.1111/e13925/toc.htm

User Guide:
http://download.oracle.com/docs/cd/E14571_01/integration.1111/e10229/toc.htm

Sample Location:
B2B Samples are part of SOA sample at below location:
http://www.oracle.com/technology/sample_code/products/soa/index.html

Developer Notes / Step by Step configuration guide:
http://www.oracle.com/technology/products/soa/b2b/index.html
http://www.oracle.com/technology/products/soa/b2b/collateral/B2B_TU001_EDI.pdf
http://www.oracle.com/technology/products/soa/b2b/collateral/B2B_TU002_HL7.pdf
http://www.oracle.com/technology/products/soa/b2b/collateral/B2B_TU003_ebxml.pdf

Blog:
http://blogs.oracle.com/oracleb2bgurus/

Forum:
http://forums.oracle.com/forums/forum.jspa?forumID=242&start=0

This article is as per Oracle B2B 11g PS2 Release (11.1.1.3.0)