Checkout http://ejohn.org/blog/deep-tracing-of-internet-explorer/ the dynaTrace tool shown here is fantastic and works with IE7.
YUI also provides a profiler.
js-profiler also provide a profiler that is working in any browser and does not depend on any framework.
I don't think debugbar has a profiler.. but it does have a debugger and a console... so you can fake it...
We use Firebugs console.log, console.time and console.timeEnd (I think) a lot.
Firebug also has a built in profiler.
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