I have been commissioned to contribute code to I2P during the summer of 2011, implementing a control protocol and a client for this protocol (similar to Vidalia for Tor). This work was the idea of Jan-Erik Fiske of ViaEuropa and Peter Sunde of flattr and The Pirate Bay fame and its funding will be generously provided by Relakks and Ipredator.
Current information can be found on zzz's forum and #i2p-dev on chat.freenode.net
Cheers
// hottuna (or Robert)