Previously Google had a toolbar for PC machines but not Macintosh, and now thankfully they do.
I've been using FireFox as a browser and you can add the Google Toolbar to that. Before you hit the "add", it is a snap to click on the ABC/Check in the toolbar and it highlights any errors or unknown names in red in the text you've written. Clicking on the word opens a box to let you choose another spelling or other options such as adding the word to your personal dictionary.
The Google spell checker is the most comprehensive spelling check I've ever seen and its free. These posts will be here for a very long time and it is your choice to make them look like you won the spelling bee in your school or not.
