Geoffrey,
The LabVIEW for Linux
FAQ page has many of the answers you are looking for.
LabVIEW for Linux is very equivalent to the Windows versions with the exception of ActiveX and NI-DAQ. Data Acquisition is supported on Linux through the
Comedi. This is a third party, open souce driver that supports many of National Instruments' DAQ boards. Also, the only toolset available for Linux at this time is the Internet Toolkit. For more information go
here.
Support is done at the same level as for Windows and can be done through all of the same ways.
Randy Hoskin
Applications Engineer
National Instruments
http://www.ni.com/ask