David,
Nope, the frame InnerHTML doesn't contain a body tag. I end up wrapping all the messages in my own body before creating the file. I use a different BGCOLOR just to help signify that it's a special message set.
There should be a public beta notice about UTFree a little later tonight. *g*
>Sounds like a fun project! Just curious, when you collect the whole thread and move it to a local .htm file, you aren't ending up with multiple < BODY > tags (one for each message) are you?