I had great success with this method. IF you have a video card with an S-Video output. I was looking for a way to do this without spending additional $100+ on software. $5 on an S-Video cable, set up my Sony Digital camera as a clone monitor, play powerpoint, record on Sony, playback through firewire cable to video capture/DVD creation software.
Of course, I was already in for (in order of $), $700 Sony D8 Camera, $100 Sonic MyDVD software, $40 FX5200 card w/ S-Video Out, and $30 for IEEE-1394 camera to PC cable. So...$100 for PPT2DVD software isn't so bad.
Lite On Progressive-Scan Multiformat DVD-R/-RW/+R/+R DL/+RW Recorder
Model: DD-A100GX @ BestBuy right now for $79.99. Add in an S-Video cable and you can get out the door for less than $100 and have a tool that will do a lot more than convert powerpoints.
Scratch that...no S-Video input on the Lite-on. Try the Samsung DVD-R130 for $139.99...nice piece of equipment with all the bells and whistles.