What is good server performance monitoring software for Windows? | I'm looking for some software to monitor a single server for performance alerts. Preferably free and with a reasonable default configuration.


Edit: To clarify, I would like to run this software on a Windows machine and monitor a remote Windows server for CPU/memory/etc. usage alerts (not a single application).


Edit: I suppose its not necessary that this software be run remotely, I would also settle for something that ran on the server and emailed me if there was an alert. It seems like Windows performance logs and alerts might be used for this purpose somehow but it was not immediately obvious to me.


Edit: Found a neat tool on the coding horror blog, not as useful for remote monitoring but very useful for things you would worry about as a server admin: <http://www.winsupersite.com/showcase/winvista_ff_rmon.asp>