These HTTPS Everywhere rulesets can be used to automatically connect to the hidden service equivalent of some popular sites. Some of these are for i2p eepsites, and some are for tor hidden services. To use these, you must use the tor browser bundle or have i2p installed.
If you have any to add I would appreciate contributions!
To install, put the rulesets you want in ~/tor-browser_en-US/Data/Browser/profile.default/HTTPSEverywhereUserRules/.
There's a basic script for *nix users to install.
Just run, ./install.sh.
HTTPSEverywhere has a good guide to make rules. The only difference is, make sure the name is prepended with the word, "Onion".
I do not vouch or endorse any of these sites. I just supply these so everyone has more privacy.