Hi. Triggering NI-DAQ from NI-Motion is a "bread and butter" application for National Instruments. In fact, there is an example program in LabVIEW that ships with the NI-Motion driver. It can be found here: C:\Program Files\National Instruments\LabVIEW 6.1\examples\Motion\FlexMotion\rtsi.llb The file that you want is called RTSI with DAQ (Breakpoint External Scan Clock).vi. This example will trigger a DAQ sample every time Motion triggers it.
Good Luck!
Kyle V