The google toolbar has a spell check function which is very useful for any site where you enter into text boxes. Along with a number of other features like a popup blocker (which you can turn on and off).
Edit: Thought there was a language translator as well but for some reason I cannot find it. Might have been some other toolbar that I had in the past.
Originally posted by invigorate We should have a spell check window open next to the box where you write your posts. This would save time and increase the quality of the words and therefore sentences in these wonderful forums.