Suddenly this morning (I guess updated via an automatic update) my Google Toolbar has a nifty feature for spell checking browser input boxes. It works fine with my Radio Userland entry edit box for this weblog as well as the Epoz based input on our corporate weblog.
Seems to have a nice array of features as well -- add to dictionary, multi-language, edit in place, replace lists. Adds a much needed feature to JavaScript/browser based input editors (and is a godsend for sloppy spellers/bloggers like myself).
P.S. It works with MSN Spaces as well -- but seems to do something weird with font size during the spelling check (the font is very small and difficult to read)