Good Rss aggregator with mysql ? (for web)

[Benj]

I'm looking for a good php / mysql rss aggregator that has the folowing feature, for inclusion on a web site:

- Will store all headlines in a database
- Older news are browsable by month
- Search engine
- Ability for users to comment the headlines

Do you know any good rss aggregator that will allow any or all of these features ?

Thanks,
Benj