ieSpell is a must have for people like me who are severely crippled by years of spell-check conditioning. I’m generally a pretty good speller, but there are some words I just alway mess up, and in formats such as this I usually don’t proofread anything too closely. ieSpell adds spell checking to all text boxes in Internet Explorer, so basically you have an web-application–independent way of checking your blog entries, forum posts, anything. Though some excellent web apps like b2/cafélog have spell checking built-in, I find this is much faster. Also I appreciate the ability to define my own custom dictionary for words that I use often and have it accessible across websites. Best of all, it’s only free dollars.