Hi,
I am sure its been mentioned before but if anyone is looking for a good Spell Checker then they could do a lot worse than using the one that comes included with the Google Tool Bar,
If you have the Google tool bar already installed as it works with nearly all of the Internet browsers i.e. IE?, FireFox etc. Then just click on the little spanner shaped icon on the tool bar then click on the "Tools" Icon then put a tick in the box next to the "Spellchecker" and that's it done.
It puts a Icon on the tool bar that you can click on at anytime to check the typing that you have just completed, its very easy to use.
hope that helps,
You can download a copy of the Google Tool Bar here:-
Google Toolbar