NASA resent (2011) presentation on LENR that appears to verify the validity of the technology and continued research on it.
A well-done visualization video of how the palladium lattice accepts deuterium and produces heat, done by the Energetics laboratory of Israel, who have claimed 25 times the energy out verses input. Their use of specific waveform shapes are claimed in dramatically improve performance.
Infinite Energy magazine, founded by Dr. Eugene Mallove, a champion of LENR and other exotic energy technology research, before his unsolved murder over 8 years ago. A good source of general info on LENR and other emerging energy technologies, such as the Mills' Blacklight Power system of "Hydrino" energy production, that uses plasma to create nuclear reactions.
New Energy Times, a site devoted to LENR. The site owner is highly skeptical of Andrea Rossi's "Ecat" system using nickel-hydrogen (for sound reasons in the author's opinion), but positive about LENR in general. Many scientific papers can be found linked here.
LENR-CANL .ORG, a site dedicated to cold fusion research with hundreds of Scientific Papers listed, and some good overview articles for laymen.
The "Cold Fusion Now" site, also dedicated to LENR research and news.