This may help. http://www.sqlskills.com/blogs/paul/query-plan-analysis-first-steps/
Also, grab a copy of Grant's Exec plans book, should be lots in there, more than you'll get as forum replies
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability