Currently in Khojand, Tajikistan and wanting to take a taxi or something tomorrow to Dushanbe. The taxi drivers here are like vultures - I was surrounded by the horde of them at the station outside town where the border taxi guy dropped me off. I've been quoted US$40 for a ride to Dushanbe tomorrow, in a shared cab, or $100 for just me (I'd go shared) but it's in a regular car and have no way of knowing if that's good or not. Googled without much luck. I've been told you should only take a jeep, or 4wd, but everyone says different things (taxi drivers) and it's hard to know who to trust!
How it turned out - see answer at bottom, successfully made it to Dushanbe without being ripped off too badly ;)