Such a service is usually limited to it's owner's attention span.
If this is open source you have my attention.
Bob
For my job, I am sending a lot of quotation to customers. Quickly, it became a real headache to remember what quote was sent to which customer. This was also the case for all kind of correspondence. There was a need for referencing all these home/office documents.
I created a small application which generated and managed these reference. It was so handy that several colleague started to use it also. From that came the idea of of transforming it into a webware on the internet, for the free use of everybody.
http://www.TheEasyRef.com
If you like it, spread the word around you!
Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic