but remember that the include command isnt allowed on most rent server for security behavor. It may work or not

If you run IIP as portal you can use a pal box for displaying a newsfeed. there are 2 or more examples in the modification index. Works well on my site.
To create your own feeds from your board to your user its very easy. Set up in the control panel the proper feed and add in include/header-insert.php the following (example):
<link rel="alternate" type="application/rss+xml" title="last 10 News" href="/ubbthreads/ContentIslands/2_rss20.xml" />
Browsers like Firefox now shows in the lower right corner a feed icon if the feed is enabled. Pretty easy.