Rated 4 out of 5 stars
I'd give it five stars but the spider does not restrain itself to a domain resulting in false positives.
There is a control but it insists on rel=external and ignores URL name changes.
Sitepoint has other suggestions, good ones mostly. I'll add one, accept a page list in text to replace spidering, then I could mod a Xenu site map and get a clean CSS analysis.
Firefox/3.0.3 (.NET CLR 3.5.30729)
Nice work. Thanks Brothercake!