R help - Jan 2006 - data aquistion cards

Another year another project.
Does anyone have any experience / pointers in obtaining data from an
analog / digital converter hardware such as a National Instruments data
aquisition card using R?
I really need to obtain and process this data in a real time enviroment
and I'm hoping that R already has packages to help me with this.
If anyone has any experience with this I'd love to hear about it.
Many thanks
Tom