Jasonking posted on our forums an NXT-G addon to allow compilation of NXT-G programs to a file on the Mac/PC, rather then the usual “Compile and Download” option which downloads directly to the NXT brick.

Setup Instructions:
Copy the file DownloadToFile.llb to a directory engine/project under your NXT program directory. If this directory does not exist, create it first. Restart NXT-G software. If you followed this correctly, you should have under Tools menu an option “Download to File…”. Select it and the above window will open up. Finally, choose the path to place the compiled file and press “Download”.