The title is a joke.  I can spell pretty well.  I just can't type – especially on this little keyboard on my Tablet. 

Microspell looks like it may work for me.  I used to use IEspell, but it's slow and hard to access from mt's edit-entries windows.  Microspell copies over the whole text of an entry, helps me to edit out the typos and plops it back. 

We'll see.