I'm a piker here. My only LT authors are Susan Wittig Albert (susanalbert), Monk Ashland (Rettstatt), Shannon Okey (knitgrrldotcom). I have almost all of Albert's books (the ones written under her own name): her China Bayles and her Beatrix Potter mysteries. I might be missing the most recent of the latter, it's on my TBR/TBP/TBmooched list. Ashland only has a single book right now, The Sky Village, but my daughters both found it entrancing and are eagerly awaiting sequels. Okey is a knitting, not a fiction, writer; I have her book Spin to Knit and enjoy it quite a lot. It gave me a lot of support when I was new to the idea of spinning my own yarn for eventual knitting.
I haven't ever gotten or shared comments with any of "my" LT authors, but a few weeks ago I did win an autographed copy of a book from another blog (hi, Fyrefly!), and the author J. Scott Savage did comment here. I still haven't received the book, though (insert frowny face from someone eager for new sci-fi to read...make that devour).
I have to say when I first saw this question my gut reaction was that I was going to have a one sentence answer...but once I started thinking about it, I seem to have had a lot to say. Maybe it's a good thing more of my authors aren't on LT (no, it's not).