We just released a new feature which allows you to preview avatar animations on the website in a 3D viewer by hitting the play button in the thumbnail box. Huge thanks to @Brouhahaha for making this feature happen!
These previews can be found by following the links to the individual avatar animations on the page of an animation package. In the future we want to update the animation package pages to also include 3D animation previews to make it easier to preview avatar animations before you buy them.
The animation previews can be pretty cool. Here are some of my favorites: