Not a definitive list but pretty darn complete. I haven't included series that I'm not sure whether I'll be following in future.
Kelley Armstrong - Otherworld
Read up to - #10 Frostbitten
To Read - #11 Waking the Witch, #12 Spell Bound, #13
Also - Men of the Otherworld Antho, Tales of the Otherworld Antho, Angelic, Counterfeit Magic
Patricia Briggs - Mercy Thompson
Read up to - #4 Bone Crossed
To Read - #5 Silver Borne, #6 River Marked
Patricia Briggs - Alpha/Omega (Charles & Anna)
Read up to Hunting Ground
Jim Butcher - Harry Dresden Series
Read up to - #7 Dead Beat
To Read - #8 Proven Guilty, #9 White Night, #10 Small Favour, #11 Turn Coat, #12 Changes, #13 Side Jobs (short stories), #14 Ghost Story
Lindsey Davies - Falco Series
Read up to - #14 The Jupiter Myth
To Read - #15 The Accusers, #16 Scandal Takes a Holiday, #17 See Delphi and Die, #18 Saturnalia, #19 Alexandria, #20 Nemesis
Jasper Fforde - Thursday Next
Read up to - #3 The Well of Lost Plots
To Read - #4 Something Rotten, #5 First Among Sequels, #6 One of Our Thursdays is Missing