Concern writes: It looks like any (dim) hope that Limewire would prevail in its lawsuit against the RIAA has just been snuffed out. Sure, Limewire has invested millions in making a high-quality Gnutella client (and protocol) over the years, but more importantly, they also extensively moderate the Gnutella network to keep out spam and worms. What's the future of file sharing in a post-Limewire world? A new team or protocol comes to the fore? An exodus to Amazon, iTunes, and the web, and a long, Usenet-like twilight for "classic" p2p file sharing?