in firefox I can usee firebug, in chrome I can use the css console. Both to make live changes to css for troubleshooting purposes. However I do not know of a way to do this in IE, which is where I have the most css issues.
So, whats the best way to troubleshoot css issues in IE?
Thanks!
Use the IE Dev Tools (video).
And here for more links and information.
They are built into IE 8 and can be invoked by F12.