Brady stumbled across this thing a while back.  I found it indespensible when reworking a skin into what you see now last night.  There is a cool little widget that pops open a new window, and when you hover over an element on the parent page, it will tell you *all* of the styles that are applied to that element - both literal and interited down the chain.  awesome awesome awesome.  Oh yeah, and there are a *ton* of other widgets in there too.  If you do any sort of web design at all, I highly suggest you grab this thing.

Here's a link to it.