I was wondering if anybody had a good reccomendation for a PHP article management script. I am not really interested in an entire content management script as i want to integrate this with my existing site. key features that I am interested in:

Ability to output a friendly print version of article
Email article to a freind
Assign a category to each article
Related Article feature
Ability to display newest/most viewed article
Track articles by author.

It would also be nice if all these pieces would act as modules/includes, so I could put them where ever I want on my existing page.

I really don't want to make a big investment as this is not a commercial site.

Any reccomendations would be appreciated.