In the past I've had problems finding a running short that isn't made of skin-tight lycra, doesn't chafe, isn't too sweaty, doesn't bind when moving and isn't tight around my arse and thighs.
Having used UnderArmour tops for a while now and being pleased with them I thought I'd give their Streaker shorts (dodgy name I know) a go.
Fantastic. Used them for a couple of weeks for running and gym-work and I can honestly say they are the business. I hadn't planned on "long" shorts but these are ok, four-way stretch fabric, very breathable interliner, don't bind or ride up and no chafing, and they are available in all black.
http://www.underarmour.co.uk/Detail.cfm?home=Mens&coll_id=47&pf_id=...
DJ