For an added dimension in your multimedia presentations , rather than plain old powerpoint take a look at Prezi (from www.Prezi.com).
I used Google Docs to create a free standard presentation , and downloaded in Powerpoint.
I then used Prezi to create the zooming effects.
I then used a software for capturing screens XVidCap ( a linux version of Camtasia)
Using Youtube’s audio swap I mixed the soundtrack on it.