Light, easy-to-use presentation software

I am looking for a Linux presentation software and the main features I need are: - **Light** on dependencies and resource consumption (*I use GTK+*) - Easy to use - Align & Distribute information on slide - Uses pictures The extra features I would like are: - On-click animations - .ppt Import/export - Use templates/themes for easily unified presentation ---------- Sliderocket looks like a presentation tool matching my needs. Unfortunately it is an online presentation editor and I am looking for an offline one. *I don't mind the software being proprietary and non-free of charge*