I would like to be able to run some functionality with a module that I am building whenever a customer registers an account, but I can\'t seem to f
Actually there are customer_save_after and customer_save_before (magento 1.5)
If you want to modify on-the-fly some data after form post, pick customer_save_before, change the data you want and that's all (the save action come after, so your change will be taken into account).
$customer->save() just doesn't work in customer_save_after. (fatal error) Use this observer to run a code after customer creation which are NOT related to customer data.
Hope that helps!