Well, considering I'm somewhat starting over in this reading thing, I don't exactly have a huge collection (yet...LOL!). I love reading series books, though. Some of the series I've read/started are: Tracie Peterson's Heirs of Montana series, about a family who headed west during the Civil War; Karen Kingsbury's Redemption series (haven't read the F or S series yet though...on my list!); James Scott Bell's Buchanan series, starts out about a lawyer trying to find out who killed his fiance.
I've also read parts of other series that I want to finish: Tracey Bateman's Westward Hearts series and Drama Queen series, Julie Lessman's The Daughters of Boston series, Cindy Woodsmall's Sisters of the Quilt series, and Susan May Warren's Mission: Russion series.
Of course there are others that I am wanting to start, but I won't list them all. These are all Christian fiction. I haven't dived into enough general market to know what I'd want to read yet, so we'll see on that (I'm open for suggestion!). I like historical, suspense/mystery, and chick lit the most.
I didn't know there was a series feature in Library Thing! I'm new to LT so I'll have to check that out.
Be sure to check out more responses to Tuesday Thingers!