I wash my hair almost every day. I may be able to get away without washing my hair every other day but Im training for a half marathon and work-out 3-4 days a week, so I always wash my hair after my work outs.
When I wash my hair I shampoo at least once, sometimes twice if my hair is disgusting, and then use a pin prick size of conditioner and then spritz with Sebastian's Potion 9 Lite. And every Sunday I use Joico K-Pak Revitaluxe.
If my hair is looking a bit dingey, but I don't have time to shower, I use either baby powder or aersol, dry shampoo.