I am a big fan of Strobist which is a blogger who dedicates his blog to the art of good lighting.
The Strobist is so talented and I think he is so kind to take the time to teach and display his work so others may benefit.
I am currently working through some of his suggested techniques and I will be posting some of my outcomes.
However I will always be a fan of natural lighting conditions and this really is my style and preference of photography (of course I use flash when needed and I use it well) but learning some new lighting techniques with flash will be very helpful.
I am also looking for a new 1 or 2 day course to perfect my lighting technique and I plan on taking a few trips in the name of photography watch this space.
Check out his website below and I will also add more inspirational people I follow, books and websites.