In Windows: 
-if you use Nero (of which you can get an evaluation copy at                   
     http://www.ahead.de), go to the "file" menu, select "burn image...", then 
     choose the .iso image. The file selection dialog defaults to .nrg type    
     images, but you can select the .iso  by changing to "file type: all *.*".

-if you use Adaptec's Easy CD Creator, here are instructions, verbatim from    
    Dan Thomson:

1.  Start Easy CD Creator, tell it you want to make a Data CD.  Skip
    or cancel any wizard if you've got it set to do that.  Just get
    into the real application.
2.  Go to the "File" menu, choose "Create CD from CD Image..."
3.  Change the file type to "ISO Image Files (*.iso)" and browse to
    the directory and file you want to burn.  Open the file.
4.  This should jump straight into the "CD Creation Setup" dialog box.
    I've successfully used Disc-at-Once and Track-at-Once (with just
    closing the session or closing the whole disc, doesn't matter)
    And both CDR's and CD-RWs.
5.  Click OK and let it burn.  Takes about 2 minutes at 4x speed if
    you close the CD, less if you don't.