I have created an Excellon (NC Drill) Import plugin for CamBam Plus, it is VERY alpha at this stage, but I wanted to make it available so people could try it and maybe send me example NC Drill files which it has trouble with.
It does NOT implement every possible function of an NC Drilling machine, but it works great with my favourite PCB design package (DIPTrace).
Just copy the Excellon.dll file to your plugins directory, and "Excellon Import" will appear under the "Plugins" menu item in CamBam Plus. Select it and a file selector dialog will appear, then a dialog box where you can set defaults and tell the plugin if you want to add the Drill Mops.
When it runs, it will create another dll file in your plugins folder - excellon.nat.dll - to delete the plugin, please delete BOTH files from your plugin folder. This version will cease to function on 1st November 2008 (when it has expired it will issue a message informing you and asking you to delete it from your plugins folder), by which time hopefully I will have released a BETA version.

BTW the excellon.nat.dll file is part of the code protection system (.Net Reactor) which enforces the expiry of the plugin on 1st November 2008).
I have also attached an example NC Drill file which I know it works with
All feedback welcomed.