Ask HN: What do you use for your digital rolodex?

I've yet to find/use something that keeps track digitally of all the people I know professionally. An ideal solution would let me store their name, basic contact info, notes about them, and contextual tags about why they're important to me.

An example need would be to search for all people I know who are developers (even PHP only developers) or all people I know who are related to agencies (own one, work at one, etc.)

Seems all the existing contact solutions are targeted at small businesses and bloated with features I don't need right now.

Anybody know of a great digital rolodex out there?