With many fans counting down the days until J.R. Ward releases Lover at Last, Book 12 in her Black Dagger Brotherhood series, and other (and some of the same!) fans waiting for the blurb to be released for Nalini Singh's Heart of Obsidian, the twelfth book (coincidentally enough) in her Psy/Changeling series, it's clear that series books show no signs of ebbing in popularity with readers.
If you read romance, you've no doubt read a book in a series. But the question for today is, how many series do you actively follow? And which ones?