Themes and CSS in ASP.NET v2
I've been playing a little with the themes in v2 and I've changed my opinion on them. When I first learned about the basic capabilities of themes I kind of shrugged it off as a, "That's neat, I guess."
My opinion has changed because I didn't realize that a theme applied to a page will drop links to every style sheet from the theme's folder into the <head> of the document. That's really useful. I still don't see control declarations in .skin files as particularly useful, with the exception of applying the CssClass attributes to certain complex controls (like the calendar), but the basic theme capability is cool.
Yet another cool feature I can't wait to use in real life.