If you go to the Hope140 page, just click "contact us" and fill out the brief form (a six-box no brainer). Your charity of choice will then be reviewed by Twitter HQ for possible inclusion on the site. Most of those that are accepted are put on the Case Studies section, where your organization will be profiled (along with a prominent logo and relevant photographs). If you're actively (and creatively!) using Twitter to spread the word about your work, you have a much better chance of being highlighted. After all, practicality would dictate that this altruistic effort is also a nice way to promote the value of Twitter, right?
Other lucky causes may receive a tab of their own on the Hope140 page, as was the case with Hope for Haiti. These organizations and/or campaigns enjoy the added bonuses of donation buttons and showcasing tweets that pertain to the cause.
Nonprofits may also be eligible for a special version of sponsored tweets called Tweet for Good. Details aren't available yet, but just tell Twitter your organization is interested and information will be sent to you as it becomes available. For Twitter newbies, sponsored tweets are essentially ads that earn you money.
So, if your charity could use some added exposure, check out Hope140. It might be a nice addition to your online marketing efforts.

