SQL Profiler - Errors & Warnings: Blocked Process Report
Now, here's a cool new SQL 2005 Profiler event I used for the first time in anger yesterday.
What I love about this event is that it actually spits out significant & useful data from both the blocked process & blocking process - locked resource, input buffer, time, spid etc into a single (xml) report.
Very handy for digging into query timeout / blocking issues indeed.