The Serial that I am reading right now, is Clean Sweep by Ilona Andrews.  It is funny, and quirky. And I love it. I might, just might, check it several times a day.  The first chapter is here.

When I was wibbling wheter or not I would I read the first Nightlights compilation to see if I liked her voice.Which I did.  That freebie is gone from Smashwords, but the free serial is still available.  ( If you like it, the complete collection is available for 3.99 from Smashwords)

Another serial I gobbled up, is the Shadow Unit serial. Think Criminal minds, but with Supernatural elements. And… the first season is free at Smashwords right now.