Native Spellcheck in Firefox

If you have not made the switch to the latest Firefox (version 2), please do so. There are several useful features but the killer feature for me is the ability to do spell check natively without having to depend on any third party utility/plugin. I can now confidently enter text in any web form - including the single line text boxes - with the assurance that Firefox will silently point out the misspellings and help me correct them. Amazing new feature!