MS Script Editor - Surprisingly good JavaScript debugger

One good thing I will say about IE - the Microsoft Script Editor is actually a pretty good debugger (try to get Script Editor instead of Script Debugger, which is a bit buggy). I could almost say the same of Firebug, but unfortunately it seems to get the line numbers wrong - the lines it displays seem to be offset from the true lines by some amount (at least on the large JavaScript file I'm working on).

Firebug is super for debugging, but when it doesn't work, at least we have an alternative in MSE.