aggregator2

Hi,
I am using aggregator2.module which I find really useful. I wanted to know two things in this module.

a) Where in aggregator2.module does it add the feed items to the node, node_revisions table? I want to know this because I want to add the link associated with the feed item to the teaser during the insertion of the feed item as node.

b) How do I get the logo and link of the site from which I aggregated the content and also the logo-link of the originator of the news item?
I have setup the aggregator2 and already getting aggregated content.

Consider a feed item from news.yahoo.com.
eg:--Small waves hit Japan after quake sparks tsunami alert (Reuters)

Suppose I add a feed as news.yahoo.com, then as the news items are added per cron run, the aggregated news have the originator in the title(in brackets at the end "Reuters" here) and the link associated with this news (under edit option) contains the address to that news on the subscribed feed (i.e news.yahoo.com). I want to show both this links along with their respective logos. How can this be achieved?

In short for the second point I want the same operability as on yahoo news.

Thnx in advance.

Nilesh.