List sessions that are being blocked

select spid
, blocked being_blocked
, db_name(dbid)
, login_time
, last_batch
, program_name
from master..sysprocesses where blocked <> 0

Output:
spid being_blocked login_time last_batch program_name
—— ————- ——————————————————————————————————————————– ———————– ———————– ——————————————————————————————————————————–
53 52 test 2010-10-04 20:40:41.780 2010-10-04 20:45:50.357 Microsoft SQL Server Management Studio – Query