Clark Goble advises:
Just a hint I discovered that was helpful when posting stuff from my email client into my blog. A lot of extended characters (e.g. the curly quotes instead of the flat ones) don't display properly when pasted in, due to differences in character sets. If you first past them to this site and convert them, it'll generate correct HTML so that they will display right.
It'll also convert properly Greek and other character sets.