Magento: how to manually customer account activation

Question

I'm developing a magento theme; but my customer asked me a particular modification: he wants to confirm manually the users registration. How can I achieve this? is there a plugin or I have to do this with an hacking the core code? Advice? thanks

Answer 1

The extension that clockworkgeek posted is great, but it isn't currently in MagentoConnect. So, here is the github link: https://github.com/Vinai/customer-activation

Answer 2

There is an extension for it:
http://www.magentocommerce.com/extension/489/customer-activation