What is a good live request monitor for Apache httpd?

I have used SeeFusion to monitor ColdFusion requests. Is there a similar tool that would allow me to monitor Apache httpd requests in real time? We have a server that was fast and responsive for months, but suddenly today, it is using 80% cpu instead of 1%, I have no idea where to start to figure out what is bogging it down.

Look at Apache’s mod_status: http://httpd.apache.org/docs/2.0/mod/mod_status.html

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