I've never used twitter before, but now I have to to see what this one person's doing. I've googled and googled and can't find any answer to this question: How do I make it, so I am emailed, when someone tweets? I would much rather not have to go to their page once an hour to see if they've said anything. Thank you!
I am afraid that Twitter doesn't dupport that but luckily every account has its own RSS feed. There are websites that will send you an e-mail when a new item appears in the feed, so you can use one of them as a workaround.
Recently Twitter launched or integrate sending email feature. This email option is show after the retweet and favorite, if you expend a tweet, just click this option and send email when someone tweet.
I recently developed a little app that does exactly that http://twoti.net/ You simply subscribe to Twitter users and you'll get emails about their tweets.