Is there a site out there that has a bunch of typical HTML for seeing what the CSS looks like once applied?  I mean, something full of table, a, div, span, p, whatever.  You go there, paste in your CSS and see the results.
CSS style viewer/tester
css;html
I just stumbled across http://colorschemedesigner.com/.It's great for choosing colors and will show you example pages to see what the color scheme would look like applied to a typical page.Update: the website is now http://paletton.com