Well, I just realized I haven't posted about milk kefir yet. I made a batch today, which reminded me to post about it. If you want to do some research on kefir, I think the best resource is Dom's Kefir Page or various recipes from Cheeseslave.
One of the other lovely things about Kefir is the sense of community you get - if you meet another kefir maker you have an instant bond. You can also bring people into your "community" by sharing your grains with them (hey, I'm Canadian so I am a socialist at heart.)
Step 1 - put grains in clean mason jar
Step 2 - fill jar up with organic whole or raw milk
Step 3 - cover with muslin, cheescloth or coffee filter
Step 4 - let ferment in warm place for 12-48 hours
Step 5 - remove the grains and put the kefir in the fridge
Step 6 - do it all again