My sponsored charity is the Human Rights Campaign.
About the HRC:
The Human Rights Campaign is America’s largest civil rights organization working to achieve gay, lesbian, bisexual and transgender equality. By inspiring and engaging all Americans, HRC strives to end discrimination against GLBT citizens and realize a nation that achieves fundamental fairness and equality for all.
Even if you don't donate through my LJ for HRC, please find another journal to sponsor.
First some terminology: "blog" is a shortened version of "weblog" which is a frequently updated personal website. Most blogs have date stamps on the entries, and consist of links and commentary.
Now, remember when you were in school and you would bowl for charity? And for every pin you knocked down you got, say, ten cents? Or run for a dollar a mile? During the Blogathon, people update their websites every 30 minutes for 24 hours straight. For this, they collect sponsorships. Pledges can be a flat donation, or a certain amount for every hour the blogger manages to stay awake.