Yes, my wish has come true (at least in part). Someone has put together an AJAX spell checker for forms. There doesn’t seem to be a specific license included, but hopefully that will get worked out and projects will start making use of this. I’ve been spoiled by having the ability to spell check form fields in Mac OS X, having this feature on the website itself would make using Windows less painful.
Yes, I know, Gmail already does this, but I want to see it spread into other projects. Anything where you type significant amount of text should seriously be looking into this. Along with the ability (should be a requirement I think) to do comment previews in WordPress, spell checking the comments comes in as a close second on my wish list.