i created an animated presentation with the Sozi plugin for Inkscape. It looks great, however, not all browsers support SVG animations (Chrome for instance does not like the Ink
You may try synfig studio, I've been using it for several personal animation projects. I'ts really nice, with good tutos / documentation / community.
http://www.synfig.org/cms/
quote : "Synfig Studio is a free and open-source 2D animation software, designed as powerful industrial-strength solution for creating film-quality animation using a vector and bitmap artwork. It eliminates the need to create animation frame-by frame, allowing you to produce 2D animation of a higher quality with fewer people and resources. Synfig Studio is available for Windows, Linux and MacOS X."
hope this helps
Philippe