This entry was rated higher than the technet article about isolation levels. I found that there are some helpful hints about blocking behavior impacted by isolation level- if you are reading from system views there are locks placed on objects that may end of block other transactions. And yes, the version is certainly behind the times

http://technet.microsoft.com/en-us/library/ms189122(v=sql.90).aspx

http://technet.microsoft.com/en-us/library/ms175909(v=sql.90).aspx