As the Sozi project website describes (http://sozi.baierouge.frinitial initial/wiki/en:welcome), a Sozi document is not organized as a slideshow (as it is in JessyInk or LibreOffice Impress), but as a poster, what gives you a diferent kind of freedom to manage the animations of your presentation. Playing such a presentation consists in a series of translations, zooms and rotations that allow to focus on the elements you want to show.
How to install
Although the instructions for installing Sozi is at their website, I'll explain how did I do this using the noob way :D.
1- Extract the zip in a folder and enter that folder
2- Open a terminal and run this command: $ su -c 'dolphin /usr/share/inkscape/extensions' -
("dolphin" is the KDE file browser, in gnome it is "nautillus". I have to advertise executing a graphical file browser is NOT a good practice, be carefull)
3- Now you have 2 file browsers: one with the Sozi files folder and the inkscape extensions folder. Now copy from the Sozi files folder all files with extensions .inx, .py, .js and .css into the inkscape extensions folder
(the window at the left is the Sozi files folder and the other one is the inkscape extensions folder)
Now you can open inkscape, and you'll see in the Extensions menu the Sozi option.
As soon as there is already a tutorial in their website (http://sozi.baierouge.fr/wiki/en:tutorial) I'm just show some screenshots
1- The presentation is created
3- After defining the frames and finishing the presentation, save the file and open the svg file with your browser
How does it work
Thanks for reading my post
Juan "HakS" Barba