Usually through friends I meet, apparently I just gravitate naturally towards gamers. Or just start a game myself and wait for people to ask to play, somehow word of mouth spreads, it kinda boggles me, and I've got a waiting list at the moment. *confused shrug*
Of course the entering games because of a friend already in with that group has its drawbacks. I call it the group from Hell, and not hell in the good vacation spot Gehenna with lava flows and acidic snow and all (Being one of the resident Arcanoloths here, it's home, what can I say). The group was disfunctional with a capital D. Before I dropped them (or they kicked me out, one of the two) they went through 3 TPK's and about 4 different campaigns. From what I hear they switched DM's, he burnt out, then they went back to the old DM and he proceeds to have yet another TPK. They have yet, in 3 years, to have a game last more than 2 months. *boggle!*
Meanwhile I've been in one game for two years, and been running one with the aformentioned friend (and she is a cutie) for over a year, and now running a Planescape game of my own thats going on 6 months with at least a year of plot left to run.
And on top of it all, the group from hell had the TPK DM as I'll call him, with an elf fixation. Specifically Forgotten Realms elves. You know, the elves are kewl type. He was a good DM in a perverse way, but inevitably there would be a super powerful elven nation of NPC in the game, regardless of setting, and the party would run afoul of them. Nature loving not in the peaceful warders of the woods type elves, but psycho E.L.F. elves with direct connections to all the powers of magic and EGO's the size of texas. *shiver*
So back on topic here, finding games through friends can be good, but I've gotten burned once, so I'm a tad jaded on it all, from now on if I ever move I'll be finding folks on my own, or just starting my own game, advertising it, then getting to know some folks in the area who game from there.