I think it might have helped to tell us what packages you've already tried, so we're not duplicating bad suggestions...
But perhaps you want either pdfcube or Impressive? (There was also another form of keyjnote called Accentuate, but the website for that seems to be down. I think there was some copyright issue with Apple with keyjnote.)
But word to the wise: I think such transitions are nothing but distractions to the content of your presentation, and can come off a little childish. The LaTeX beamer user's guide contains a ton of advice on how to create effective presentations, even if you're not using beamer to create these presentations, I think it's worth reading the first half of the guide.