The purpose is to crawl data from existing sources, so we don't need to build the WoT from scratch. The bitcoin-otc crawler is on GitHub too.

In Identifi, anyone can do identity verifications (i.e. make connections between identifiers) and choose whose verifications they trust. Anyone can start building a good reputation in identity verfication. A pseudonymous identity is just an identifier (a bitcoin address for example) that hasn't been reliably connected to the identifiers of an actual person.

Most users will probably be using the network through a web service, but I'm planning to make it easier to be run locally. A browser plugin would be an interesting solution.