I am a big fan of wordpress and I love using it in all my websites. If there is anything I don't like about wp, is it's registration system. The only fields available in the registration form are Username and E-mail. But it would be great if it is possible for the admins of the site to add custom fields like Company Name or College Name etc.. Also, allowing the users to choose their own password instead of randomly generated ones would be time saving! There are a number of plugins available to do these, but still I would like to see this feature integrated into the core wp files.