http://www.spellcheck.net/

Lots of text-manipulation tools as well. However, it didn't do well with British spelling (-ise, -our, etc.)...

http://babelfish.altavista.com/babelfish/

Translate English into Chinese, French, German, Italian, Japanese, Korean, Portugese, or Spanish. Also translates the other direction.

翻译英语到汉语。
Traduisez anglais-français.
Übersetzen Sie Englisch zum Deutschen.
Traduca l'inglese ad italiano.
英語から日本語を翻訳しなさい。
한국인에게 영어를 번역하십시요.
Traduza o inglês a Portugese.
Traduzca el inglés al español.