Profile Page Bio Info

I think that this is a hack request which is why I have posted it here rather than at vBtemplates. But if I am wrong I apologise.

I know that I can add custom fields to the profile page without hacking, but I would like to add an extended Biography section. So people can write up a long bio and add smilies etc.; maybe some colour.

Basically I am after this as I have a thread on my site, "By way of Introduction" but thought that there details which were in it would be more useful if attached to a users profile page.

Any help would be greatly appreciated.