Surfaces - Import ESRI Grid

I have a number of grids which have been created in ArcGIS. I wish to import these into gINT to create a surface. However I dont know of a way of exporting these out of ArcGIS and into a surfer .grd format. Does anybody have any ideas?

Is the possibilty of ESRI grid import on the list of improvements for the next version of gINT?

Thanks

Rob