e-cigarette-forum.com is a forum full of knowledgeable people and a fair amount of valid reading. Check it out.

Electronic Cigarettes is a pretty cool blog talking about the latest stuff in the niche.

wikipedia - obligatory link to wikipedia page

electronic cigarette is a pretty up to date blog talking about new products and companies in relation to ecigs

njoy - one of the biggest and first ecig companies

More to come as i find time.