Drupal rocks! *ahem*
Well I've spent most of the afternoon hacking about with Drupal for work (not this site) and it never fails to impress me a) how well it is written, or b) how quick it can be to implement something (caveat: once you know how it works!).
For anyone that cares I've been modding the ecommerce module to allow VAT to be applied to products and calculated properly. You can even set a VAT rate in the store admin. Jubbly.
20:24pm... home time.