Thanks for your work. I've been using for a while but I have just found some erratic behaviour that has forced me to deactivate it.
I use version 0.2.7 in a website with WP 3.1 and the e-commerce plugin: http://www.halloffame.es (although it is now working fine since your plugin is not active)
There is a widget with the shopping cart where customers add their products until they are ready to place their order.
Well, as soon as I activate the plugin the widget does not remember the products from page to page and starts from zero, replacing whatever products are in the list, instead of adding the new one.
Want to hear something funnier? Chrome seems inmune to this bug and works fine, while both IE and Firefox fail!