In 2002 Google introduced the ability to narrow search results by date, but it was quite difficult to use.
I built a simple way to access the feature, which proved quite popular.
While Google has made it easier, it is still a hard-to find feature.
Here I present an easy-to-use interface to search not only Google, but other tools which can be narrowed by date range.
If you know of others, please suggest them.
November 17, 2010: Added several new search engines: Ask.com, Exalead, BlogPulse, and Topsy. Moved Google Groups into Miscellaneous category and split News, Blogs, and Realtime off from the General category.