I'm very very new to this but so far:
1) I've bought a few quids worth - 59 euro to be precise
2) I've recently joined a sig campaign
3) Faucets, although I only go with the gambly ones that give me a teeny tiny chance of getting something significant once in a while (freebitco.in is mainly it, although I like luckybitfaucet too)
4) Gambling - lost my first 50 euro in a single drunken evening, but have played my 9 euro second purchase up to 1.3 bitcoin on swcpoker over the last few days
I'd like to find some more ways to earn it. I am a writer and about to release 6 chapters of my first book, so maybe I can find a way to offer that for Bitcoin as well as cash. And I might do a houseclear soon and sell the stuff I don't need for Bitcoin. We'll see.
Ist.