I just found this too good to be true Spell Check Plugin for WordPress based on AJAX, yes, you read it right. It's caleld Visual Spell Check and currently works in FF, IE and Opera. It works well for those using the NON-WYSWYG editor for WP like me. iT's 100% amazing and 1337. I request some WP Admin to please install this as it is great and time saving too!
Here's teh URL http://matthew.delmarters.com/weblog/visual_spellcheck/