Filangy appears to be a tool to log webpages visited, allow bookmarking of specific ones, and search them. Browsers already have most of these features, but this makes the cache persistent and allows better searching.
It looks quite interesting, although more in the "that might be useful to implement locally" sense then wanting to let an anonymous company know about all the webpages I ever visit. I'm still feeling a little burned by Six Apart after their unexpected introduction of fees for Movable Type. At least, since I was using their software, not their services, they couldn't hold my data hostage.