Encyclopedia Britannica has made an interesting move with their online presence: they're offering it free for all web publishers, including bloggers. I learned about this at TechCrunch, which has a post detailing the program: Encyclopedia Britannica now free for bloggers.
Not only can bloggers access encyclopedia articles for free, their readers can access any article they link to. For example, you should be able to read this entry on history of technology (you'll see ugly ads, though; it's ad-free when you sign in).
I signed up out of curiosity and because I'm unable to resist free books. I can't say I use encyclopedias much these days, but I do look at (and link to) Wikipedia more and more, and this will probably sway me to check out Britannica in such cases.
Their welcome email alerted me to the "Google Subscribed Links" program, which I hadn't heard of before. It tweaks Google to include results from "trusted providers" when you search. That's a good idea and will probably also get me checking out Britannica more often, since I won't have to go directly to their site to search.