TwittAd allows Twitter users to monetize their account by accepting advertising on the background image of their Twitter user profile. You decide the duration and price advertisers pay for exposure and get paíd for every hour you serve the ad. TwitterCounter lets you add a daily updating TwitterCounter to your blog so everybody can see how popular you are by the number of persons following you. TweetBeep is just like having Google Alerts for Twitter. It enables you to keep track of conversations that mention you, your products or your company via email. You can even keep track of who's tweeting your website or blog. It's a great tool for online reputation management and you don't even have to be a Twitter user to benefit from it. TweetBeep is another one of my personal *must haves*.