When talking about user interfaces that encourage the user to sign up, it is common knowledge to remove as many obstacles hindering the process as possible. Yahoo! Mail is probably one of the smoothest interfaces out there. It was going fine for me until the interface told me to go and
I’m not superstitious or anything. But I smell Skynet’s pawprints on Web 2.0.
Funny, but capchas sure are irritating. It helps prevent spam, but it unfairly puts the earnest on the user that he’s legit (i.e. ruins the user experience). After I saw capchas which even no human could possibly read, I switched my blog from it to a comment spam filter instead.