I actually lauched a WebCite kind of service back called Svonk back in 2009, unfortunately it got VERY little usage - like just a couple of hundred hits a month, and it got no external promotion. Here is a tutorial video http://www.youtube.com/watch?v=V9b2Xgi-xLM and the old press release if anyone is interested http://www.prweb.com/releases/meronymy/svonk/prweb2900644.ht... It had a RESTful interface and everything. I guess could re-launch it as I still have the source code, if there's an interest for it that is.