Organizing articles for happy Googlebot

[punisa]

Hello friends,

I run a news site, mainly short RSS feeds, comments etc.
Daily we publish (automated) cca 200 news articles. These are categorized with keywords etc..

My question is this - how to keep these articles indexed once they go off our front-page?
I *could* create dynamic pages that would look like www.example.com/keyword/
and then list all related news sources.

But how in the world to implement SEO to such pages?

PROBLEMS:
1. too many links. For example keyword "football" might have over 10.000 articles in DB
2. what to do with meta tags, especially title and description?

Is making such searchable library even a smart move? Will it just spread my PR all over the place?

I already made a great search feature for my visitors, it uses Jquery, ajax, flash and whatnot : D But naturally Google doesn't even see these results.

I'd really REALLY appreciate to hear your ideas, especially you guys that run similar sites with many many articles.

[tedster]

I'd say just have one home page link to "Earlier Articles" - or maybe a few links if there are some clear categories. All you should need is some click trail to browse to the old articles, rather than just a search result.

This is what I've done on several sites (although none with a volume of 200 new articles every day) and it works well.