If you want your handouts to look like this, with lines:
Then right-click on the following lines graphic and choose to download it. Put it somewhere you'll find it like your desktop or user directory.
Then when you want lines in your handouts, choose the three-per-page handout. Drag the little boxes representing the slides to the left side of the page. Then choose Insert > Picture > From File, find the graphic (linesgraphic_forhandouts.png or whatever you named it) and put in where you want it in the handouts.
The graphic will look like this. If you don't see all the lines, don't worry. They're there; they just aren't always displayed because of some sort of pixel graphic thing. ;>
To print handouts, choose to print, then click Options. Select the Handouts checkbox, unmark Drawing, and click OK.
Then pick your printer and click OK.