I don't believe that. You know all that text you already have? Just go through it and highlight the key points. Then out of those key points pick the ones that matter most to an ordinary person who just happened to stumble upon your website.

Look at the WriteWith.com site: http://writewith.com/ One sentence explains it and the screenshot is nice too. But after the first sentence, it has a little list of things a user can do, "upload documents, share with other people, chat, assign tasks, and track everybody's actions with a comprehensive history." And you can figure out wtf it does in just two sentences...amazing huh?