rss aggregator

There are a few rss aggregators which I like:

http://www.trawlr.com/
http://www.gnome.org/projects/straw/
http://feed-on-feeds.googlecode.com/

However, none of them quite match my needs. Trawlr is nice, but I want
the data in my own db so that I can work with the data if I like.

The straw project is nice, but they're not using rails conventions.

Finally, feed-on-feeds is closest to what I want in that it aggregates
feeds using standard LAMP (in this case, PHP). However, I like rails, so
basically would like to clone/redo feed-on-feeds using rails.

So, I started:

http://code.google.com/p/rfeeds/

Having a better grasp of how to use the relationships thanks largely to
this list, I feel more capable of tackling something like this.

However, the primary concern is how to populate the database. I don't
mean putting some data into the migrations, or even loading data with
SQL, but grabbing feed data from the internet.

How would I use something like:

http://www.igvita.com/2007/03/22/agile-rss-aggregator-in-ruby/

to grab feeds?

thanks,

Thufir