Ever find yourself having to do something like what is suggested in this answer, http://stackoverflow.com/questions/567590/asp-net-absolute-path-of-a-url#answer-567632 ? If so, you should check out the GetFullUrl method located in the Sitecore.Web.WebUtil class. This is, yet, another useful method in another useful class!
You pass it a string for a relative path such as:
And it returns to you:
This can be very handy when you’re trying to generate fully qualified URL’s.