Would like to see an XBee breakout that had just the XBee socket and a regulator for battery use; either LDO and a LiPo connector, or a boost power converter for AA or coin cells. A tiny proto area to populate with sensor connectors and pull-down resistors might be nice as well.
The idea is for battery-powered stand-alone sensor applications, thus the XBee nodes would be programmed off-line and no level-shifting or FTDI needs to populate the board.