Subheader is one of the intersting fields in timtab (tt_news). Sometimes it happens that teaser text (abbreviated part of the news) does not look good on the screen. For example, when I wrote a post about keywords, teaser text looked like:
I wanted to add keywords META tag for a long time to this site. While it does not change page rank, it is still good to have. So I took a look to tt_news code and added the following to my main TS setup:
page.headerData...
As you see, part of TypoScript went to the teaser and it does not look good. So I filled in Subheader field and got this in the teaser instead:
I wanted to add keywords META tag for a long time to this site. While it does not change page rank, it is still good to have. So I took a look to tt_news code and...
Looks much better!

shouldn't there be some code here? ;-)
gRTz
ben