I am using a microchip MCP73213. See data sheet at http://ww1.microchip.com/downloads/en/DeviceDoc/22190b.pdf. It the suggested circuit diagram in it.
It is a very simple circuit and I hook it up to a set of these: http://www.dealextreme.com/p/trustfire-protected-18650-lithium-battery-2500mah-2-pack-blue-5790.
Which sit in this holder: http://parts.digikey.com/1/parts/1937866-holder-batt-li-ion-2cell-4pc-pin-bk-18650-pc4.html