A while ago I put out a cry of help to import a large amount of pages from an old site to my new Joomla site. I did indeed find a plugin that does a very nice job of this called HTML 2 Articles http://bit.ly/p0TVj4
The cost is around $118.00-ish but for the amount of pages I needed to convert it was worth it.
Just want to share this with you all.
Best to you in 2012!