I\'d like to know what stored procedures are currently running to diagnose some performance problems. How can I find that out?
Very useful script for analyzing locks and deadlocks: http://www.sommarskog.se/sqlutil/aba_lockinfo.html
It shows procedure or trigger and current statement.
You can use SQL Profiler to find that out.
EDIT: If you can stop the app you are running, you can start SQL Profiler, run the app and look at what's running including stored procedures.
I think you can do execute sp_who2 to get the list of connections, but then you'll need to run a trace through SQL Profiler on the specific connection to see what it's executing. I don't think that works with queries that are already running though.
Using Enterprise Manager, you can open the Management tree section, and choose Current Activity -> Process Info. Double clicking on a Process ID will show you what that process is running. If it's a stored procedure, it will not show you the parameters. For that it would be better to use Brian Kim's suggestion of using the SQL Profiler.
DBCC INPUTBUFFER will show you the first 255 characters of input on a spid (you can use sp_who2 to determine the spids you're interested in). To see the whole command, you can use ::fn_get_sql().