Several times / day, recently, we see the anxious query
I write essays and spell check is not working...What is up with that and when will it be fixed?
We know that it isn't working - Blogger has even stated so
The "Check Spelling" button in the Blogger post editor is currently non-functional.
If Blogger fixes it, maybe they will let us know. You can watch the Known Issues for Blogger feed (in the sidebar, to the right), or you can subscribe to a feed here. One day, you may see an update.
Of course, if you used Firefox, you wouldn't bother with this spellchecker. The Mozilla spellchecker is more robust, and applies to all web sites. And you can add your own words to the dictionary.
But, if you insist on using Internet Explorer, you'll have to wait for Blogger to fix their product. Or maybe find another third party product. If you use a word processing program, like Microsoft Word (which does have spell and grammar checking), be aware of the possible problems.
>> (Update 2/22): We see an update, not yet in Known Issues though.