I just wanted to post something letting those of you who may be just learning about building your site, or someone else's - but may not know about Firebug - how awesome of a tool it is!
You can take any website, where they may have a font you like, or a color you want to identify - or just a cool feature like special borders, layout, etc. and you can simply click on that area of their website and see the CSS, HTML, layout, and even scripts.
What's even more cool is you can look to see what keywords your competition is using to optimize their sites. Naturally - you are never going to steal - but you can certainly gain inspiration. And it helped me come up to speed learning CSS much faster because I can see how other's use it to achieve results. It was especially useful in helping me understand inheritance.
In summary - I just highly recommend that if you do anything with developing websites, and you don't know about this yet, that you have this free tool in your toolbox.