Is there anywhere that I could find a list of the styles that come with DNN?  I'm looking for a list of their names - better yet what they are usually used for but I'd be satisfies with their names.

Thank you.  This is very helpful information.  I have another question though.  I'm using DNN 5.  I did a view source on one of the pages to see what style was used on the standard breadcrumb trail. It uses a style called 'breadcrumb'. The only place that I'm seeing a reference to that in a stylesheet is in the skin.css associated with the MinimalExtrophy skin that I happened to add to the site. I'm using the portal default skin for the page.  And when I look in the stylesheet associated with the portal I don't see a style called 'breadcrumb' either. I was attempting to keep the styles that I'm using in the module I'm writing consistent with the rest of the DNN installation but now I'm concerned that the at least the 'breadcrumb' style is not actually a standard style.

Any Ideas?

Thanks.  That clears things up.