WordPress developer and entrepreneur Vladimir Prelovac launched Respelt, a spell-checking web app, in November. See the launch video after the jump below.
According to their site:
Respelt is a free online spell checker with a powerful feature set. It help you spell check your documents, web pages and even RSS feeds. Today, when sites are often judged in a blink of an eye, you want to make good first impression and Respelt will help you make sure you do not have any annoying spelling errors. Also spelling errors will cause your page to rank lower in search engines. By using Respelt you do not have to worry about it any more.
There is no plugin or download necessary, since Respelt operates primarily using RSS feeds. I checked our feed out and, aside from common internet and WordPress terms, we passed with flying colors. Consider our bakcs patted.