Thank you! At least someone has heard of it. I know it is in the shadow of Dresdon, but man, this series is so good. He has four other series other than Nightside: Deathstalker, Secret History, Forest Kingdom, and Hawk & Fisher. The latter are his two different sword & sorcery fantasy stories, Deathstalker is his scifi/space-opera, and Secret History is his new, sci-spy series. I was consider getting the latter and Deathstalker, but I'm still not sure if I want to get into them just yet. Nightside only has a few more novels left, I believe. 12, I'm pretty sure.
If you want to catch up quicker, you could get the Walk on the Nightside HC that collects the first three books: Something from the Nightside, Agents of Light & Darkness, and Nightingale's Lament.