While visiting Textisim I read of the release of a Textile, a web page that will convert plain text to HTML.
The author, Dean Allen, says:
"…one should now be able to paste in text copied from a word processor on any platform, and see proper corresponding HTML entities in the result."
It is similar in nature to our very own "Decoder" script except that it is form-based web page. This might come in handy when when you are not at your usual PC where you had the Decoder Bookmarklet installed.