"Where do you learn about great audiobook titles? Buy your audiobooks? Share your secrets with the rest of us! We’d particularly love to know what narrators or publishers are active in social media or do a great job communicating with listeners."
I wish I had a good answer, at least to the first question. I've learned about many good ones through my online book discussion message board; it used to be at TheNest.com and then many of us migrated away to a site on ProBoards. That's where I learned about Nora Roberts' Bridal Quartet, Karen Moning's Fever series, and a few more. I started picking up on patterns and a few production companies and narrators I liked, and I would search for more works by them.
As to where I buy my audiobooks, I try not to. They are expensive. I used to download almost all of my audiobooks through OverDrive from either my local library system or the Free Library of Philadelphia (as a PA resident whose local library is in the PA Access program, I can get a free card to any other participating public library in the state). Sadly, now that Brilliance Audio has pulled its titles, I will probably have to find an alternative way to get my fix.
I'll still borrow what I can through OverDrive, check my local library for titles they may have on CD, and hit up LibriVox for free recordings of classics. I purchase some titles used on CD from Better World Books. I'm considering a couple of CD rental services (Simply Audiobooks and Audiotogo, similar to the Netflix disc program, for the near future.