If you’re someone who isn’t the greatest at your grammar or just type to fast to go back and edit the tying mistakes. It may be worth looking into installing the Mozilla Firefox Browser. It comes with a built in dictionary/spellchecker, much like you see in Microsoft Word. When you enter a word that might be spelt differenly or incorrect it is underlined with read like MS Word does.

A great tool for those who want to save time when they are blogging and may other add-ons available for Firefox to make blogging easier.

FireFox 2.0 - Take back the web