I've built a few portals using this:

[link|http://mamboserver.com/cat/What_is_Mambo?/|http://mamboserver.c...t/What_is_Mambo?/]
[link|http://www.mamboportal.com/component/option,com_frontpage/Itemid,1/|http://www.mamboport...ontpage/Itemid,1/]

You can put together a portal very quickly with this OSS project!

If, on the other hand, folks in your neck o' the woods have not
yet achieved OSS enlightenment, there are a number of straight
forward commercial offerings, such as:

[link|http://www-306.ibm.com/software/genservers/portal/enable/|http://www-306.ibm.c...rs/portal/enable/]

There is a trial download available, I think.

I have also done a bit of work with Oracle's portal offering, but
found it needlessly complex.

My $0.02,
Slugbug