You may have seen some showcases demonstrating CSS3 capabilities along side HTML5 whether it's rendering iOS icons to Cover Flow however what isn't often shown is SVG's capabilities despite being a better substitute to using excessive CSS and HTML mark up. Despite being around since 2001 implementation of SVG in the browser has been slow due to it's extensive specification which resulted in two more simplified profiles of SVG Basic and SVG Tiny. That said you will require Firefox 4 at the time of writing to view the examples, images will be provided as substitutes.
We are eagerly awaiting SVG support in other browsers but it is a good look into the future
These examples are just some of the upcoming uses of SVG, it's definitely a technology you want to keep an eye on besides CSS3 and HTML5.
For a great video of SVG filters check out Paul Irish's blog: http://paulirish.com/2010/svg-filters-on-html5-video/