you might check out fyuze. it's an aggregator that i have been slowly developing over the past year or so. it doesn't meet all of your requirements, but it might be worth looking at. it has many configuration options and extras such as "synthetic" feeds which allow you to monitor topics/keywords and categories and not just specific sites. i try to incorporate and feature requests that users make (for example, just added an option to strip HTML out of descriptions when displayed), so if there's something you'd want from it, let me know.

First impressions of fyuze:

1) signup should be possible with an email address containing a "+" (my preferred way ot tracking email is Qmail (see www.qmail.org)
2) layout is a bit funky for my taste, but the idea of skins souds good...
3) More feedback when I get an account ;-)

I wrote something about my experience finding a
good aggregator for Linux:
http://www.boblycat.org/musings/archives/2002/09/04/news_aggregator_for_linux.html

Also see http://ourpla.net/cgi/pikie?RssReaders and http://ourpla.net/cgi/pikie?RssReaderWanted

Hey, it's John here (the information junkie). Seeing as I couldn't find your email address anywhere on your site, I thought I'd just post a comment.

The link you've got to my aggregator (http://john.bpa.nu/), is no longer valid. That link now points to my personal site. That link should never have been valid, I have no idea how it ever pointed there.

http://headlines.bpa.nu will take you to the aggregator you first saw. Also you might be interested to know http://athena.bpa.nu is where I'll be doing development on the 'proper' version of my aggregator (ie. ability to add/remove feeds, user customisation of feeds, etc, etc). At the moment there's just a bunch of php scripts, and a functional spec, but hopefully I'll get back on track once holidays are here.

Hi there John, thanks for the note; the URL is duly noted. Cool aggregator btw :-) (I saw it in my referrer logs; that's how I found it the first
time...)

Keep up the good work!

Best regards,
andersja

One issue I found with many news aggregators I found was that I still had to go and read the top stories from *each* channel. So, I ended up writing my own that shows cumulative items from ALL feeds sorted chronologically. eg:http://vsbabu.org/mt/feeds/

It is a Python script that I run periodically - http://vsbabu.org/mt/archives/2002/09/22/news_aggregator_less_dirty.html

Some feeds (notably, Mark Pilgrim's) seem to have changed the link element's representation - that bug needs to be fix it. Anyway, it works for my viewing habits - check one page every hour or so and proceed to interesting stories.

You should check out the news plugin for Trillian Pro. A brilliant chat-client now with optional news-support :)

http://www.ceruleanstudios.com

Trying this ... http://www.tidakada.com/cafeRSS/

Trying this ... http://www.tidakada.com/cafeRSS/

you may never find a better visual experience than Klipfolio - really worth checking out