The plugin VM AddToCart Effect CK adds some cool effect when adding to the cart in Virtuemart. You just have to click on the "Add to cart" button, then the main image slides and go into the cart before adding the product.
Demo of VM AddToCart Effect CK
Options of the plugin VM AddToCart Effect CK
The plugin has been tested on Joomla! 1.5 and Virtuemart 1.1.x (version beta) and on Joomla! 2.5 and Virtuemart 2.x (version 1.0). This version works in the product detail view and in the category view.