According to Apple,you can export one or more slides you create in Keynote 2 to iPhoto and even iPod photo. It doesn't specifically say it works in iPod gen5, but it wouldn't hurt to try their directions at the link below
http://docs.info.apple.com/article.html?artnum=300700
Let us know how it turns out.
Kathlyn Lindeboom
The Mistress of Mmmooooo!