I'm a big fan of SVG (
Scalable Vector Graphics) and use it a lot at work for creating interactive mapping interfaces. SVG is basically an open version of Flash based on XML. Sure it can be slow at times and it's not as cutting edge as it used to be (what with the current AJAX revolution) but it's easy to develop for and Adobe do a
neat free plug-in. Also the latest versions of Firefox have native (albeit limited) support.
Well, although it hasn't really taken off a company called evolGrafix (find them at
http://gosvg.net) is allegedly creating a new plug-in which runs on IE, FF et.al. as well as Pocket PCs and Symbian phones. Sounds too good to be true? Well, they're been promising an alpha for a while now but it still hasn't materialised. If/when it does it should be great. Heres hoping...