A new feature from Google Labs will let you view your website through a special overlay that will predict the amount of browser real estate users will be able to see on your website. A useful tool for making sure the most important parts of your site are readily seen by the majority of users.
Twitter's recent security crackdown includes a list of 370 passwords that will not be allowed when signing up for new accounts (no word on whether changes to existing passwords will have the same restrictions).
I'm thinking that a server script and/or javascript filter using this list could help cut back on a lot of bogus registration attempts in addition to protecting users from themselves.
Here is the list in a text file via the TechCrunch article.