There are a myriad number of ways to do this, probably the easiest at present is the "one click" install of Joomla/Mambo available via the Control Panel.
In addition to reasonably good CMS functionality, there is a RSS newsfeed publishing module included in the basic installation.
Not having seen your site (URL?), I'm not sure what tools may be available to you, but I am sure that magpierss (Available on sourceforge.net) will offer you that capability. You will need to retrieve and install the software, and integrate the display into your site, but it is not really that difficult.
There is quite a bit of discussion, and some sample code, about this process in the thread found at http://discussion.dreamhost.com/showflat.pl?Cat=&Board=forum_programming&Number=22415&page=&view=&sb=&o=&vc=1
toward the middle of the thread's messages. There are likely other tools that may be easier to use on your site at http://www.hotscripts.com.