OK, confession time. I never spell check my blog. Mostly, its the hassle factor - I blog, I post, I do not take the extra step that spell checking requires.
However, I just spell checked a few entries, was somewhat aghast at the number of dumb typos (mostly) and misspellings (occasionally), and I was also pleasantly surprised at the user friendliness of the blogger spell check function.
So....I am going to try to spell check entries in the future, for my readers' increased blogging satisfaction.