What: ClickableNow, which launched in July from Shift Communications and Whitley Media, helps consumers make their Twitter backgrounds "clickable." By allowing visitors to click straight through to a Web site or e-mail address, the service makes interacting outside of Twitter easier.

For the time being, there is one drawback: Twitter users must also be using ClickableNow in order to view and click on the links.

How: The site works particularly well with Twitterers who have designed their own backgrounds that ...