Given the recent change to insert the "main" tag in the page title for SEO purposes (Why is the first tag sometimes in the tag of some questions?), I think the page title would look a lot better if the tag was in the correct case (eg
ASP.NET instead of
asp.net). The lower-case presentation in the page has always been OK given the way it's styled, but I find it really grating in the title.
It should be really easy to implement - update the TagName in the tag table (there aren't that many where it's a "big" issue), and add
text-transform: lowercase; to the tag CSS.