They sort of are my target market, given that my current objective is getting votes. If there were taxi discussion boards out there I'd give them a try, but it's not the kind of thing that communities form around. I figured other programmers/hackers would be more likely to help a fellow programmer out than the average person.

My long-term goal is, of course, to attract taxi riders. But right now the app is only just functional (and is a spare time side-project), so I'm not looking to get thousands of users just yet. Hacker/VC opinions on the app and/or concept are of course welcome, though :)