Hi derhamm
First start by clearing space on your main HD of items you no longer need or back them up to an external HD or to DVD. You will need 20GB's of free space. Make sure you have at least this kind of available HD space on the HD you are booting from.
Secondly you can use iDVD6 for the slideshow presentation but I'd caution that you not exceed 99 images for reliable playback. Some set top dvd players have issues with anything over 99 images. Be careful not to exceed 99 photos.
Or consider investing in one of these apps that work well w/ iDVD6:
http://www.lqgraphics.com/phototomovie.php
http://boinx.com/fotomagico/overview/
If you can't afford to shell out the cash for this additional software, and you have more than 99 images to present then make the slideshow as a QT movie in iMovie > iDVD6. Won't look as good but it will get the job done.
Hope this is Helpful.
