Apparently they ARE Berg connectors or even mini-molex (heard them called BIRD).
Here is a page on common computer connectors
http://www.remotelan.net/tutorials/power_supply/connectors.php
I have no idea what those black tabs are called. The one you showed is often found as an audio connection or for something with three wires and a common ground with the second terminal empty to break the connection if inserted backwards (the outsides are ground/neutral? and negative and there is no pin on the board where the corresponding empty connector is so that B+ will never get sent to any pin except B+
For audio they should be -++- or +--+ so that the only error you'll have is L and R reversed.
At least that's what I think.