I recently used Omniglot to identify a script I saw on a gravestone in Colma (it was Burmese).
Highlights include Sutton Sign Writing (a written form of signed languages) and the other Alternative writing systems, including a lot of science fiction scripts- Atlantean from the Disney movie, Hylian from the Legend of Zelda, and of course the Tolkien languages!
Web link of note: Omniglot
(At http://www.omniglot.com/)