I have a few authors' blogs & a review blog that get routed into my RSS feeds daily. The authors frequently allow others to guest post about upcoming new releases, and I've found a fair number of books that way. Having those posts routed directly to me via Feedly has been really effective, rather than having to check blogs regularly (before, I'd forget to check them for days or weeks at a time, and I can process through dozens of posts in just a short time this way). If a book that's been reviewed or discussed this way looks interesting, but I'm not ready to buy just yet, I'll send the post to Pocket and tag it so I can find it later.
Recommendations here provide me with quite a few as well. I tend to watch the threads in the Deals & Reading Recommendation sections, but I've found people mention books and authors they've enjoyed in just about every part of MobileRead.
