Watch the Dorian Scale: The Other White Meat and it's Delicious online guitar lesson by Jeff Scheetz from Blues Jam Survival Guide
The Dorian is a great scale to help you step out of the pentatonic box. It will work most places where the minor pentatonic scale will work over most bluesy progressions. It is not a good choice over a straight minor blues, but over most other blues it works great. It will definitely give you some options when it comes to soloing.