ISP with Power Kit
Breadboard Compatible ISP adapter, with a minimal footprint that doesn't obstruct much of the breadboard, and a switch for connecting or disconnecting power from your programmer to your breadboard. This comes as a kit and requires soldering. Instructions are here.
It is a breadboard compatible ISP header that plugs into the power rail, and takes up minimal space, obstructing as few connection points as possible. It has an ON/OFF switch for either connecting power between your breadboard and programmer, or isolating power. An LED indicates whether power is connected (ON) or not (OFF).