Watch the Funk E online guitar lesson by Jeff McErlain from Essentials: Advanced Blues Rhythm
Sorry about the cheesy title on this one, but hey, it's not easy to name these things! Anyway, a funky blues is an important groove to have in your bag and deceivingly difficult. Most everyone's first thought is to overplay! Believe me I know, as I was guilty of it for years. This is where listening to people like James Brown, The Meters, and Booker T & the M.G.'s had a huge impact on my approach. I realized that repetition is the key to a funky part. Find that part and stick with it for a while, sometimes the whole tune actually.