On a v1.6 board - you have to wait for someone to release a solderless adapter...
Currently, the Xodus (Xenium) and SmartXX (SmartXX) guys have shown us something, however, nothing is available at this time...
In the mean time, you can choose to wait, or have it soldered in.
SmartXX product - http://www.smartxx.com/news.php
(may or may not work with the X2.6 as there is no indication whether or not it will supply the 5V necessary as their chips don't require it)
Team Xodus product - http://www.teamxodus.com/modules.php?name=...=article&sid=68
(you need the S.P adapter, which is not yet available)