I really like these types of articles because it is interesting information that I wouldn't normally go looking for, though I probably should. I might be able to get this information from BOL but has anyone ever sat down and just read BOL? Not very fun.
Is there any chance of a sequel that demonstrates how one might modify a query to get different results? I know most of it relates to indexing but if there is any way to give the SQL Server engine some subtle clues as to how to perform the join rather than using query hints, that would be pretty cool.