So far, I've met and interacted with: Rina-Chan, AnimatedJames, DustyKatt, Private Stampede, FiMFlamFilosophy, Kimlinh Tran (who voiced Scootaloo in SWAG.MOV), and BlackGryph0n.
I've rubbed elbows with pretty much all of the brony musicians at one point or another online. As for real life, I've attended Everfree Northwest for the past couple years in a Media capacity for Everypony Network, so I've gotten to interview a lot of the guests they've had. I'd have to look back through the convention books to remember them all. Off the top of my head, there's been Rebecca Shoichet, Maryke Hendrikse, Peter New, Lee Tockar, Michael Dobson, Cathy Weseluck, Tony Fleecs, Georgia Ball, and Heather Nuhfer.
JohnJoseco, Thorinair (personal friend of my actually), PixelKitties, Princess Addicta, Living Tombstone, Perry Dotto, Icky, HMage (+ some of mlp staff (Andrea Libman, Michelle Creber, Cindy Morrow, M.A. Larson, Peter New, Nicole Oliver)) (all irl)