I think that this might not be a good sign for your future SERPs. Feedraider has some authority to have the ability to throw a brand new post above you. If people start linking to their service in mass then their posts could stick in the position above you in the SERPs. I've seen that with Topix.net and some topic specific news sites in the US.
If they grab your feed from a syndication service there might be little that you can do about it beyond yanking your feed from syndication. If they are grabbing the feed from your domain you might be able to selectively ban them if you can figure out their IP address. Maybe they would be good guys and stop picking up your feed at your request.
For sites that I own or watch, most initially have the ability to get their homepage indexed quickly, then as they grow in strength their posts become indexed almost immediately. Even though you posted first, Feedraider's post page was indexed before yours - at least in this situation. That suggests to me that they might have some authority underway.
This leads to the interesting topic of the "reach" of a domain. Powerful news sithes like CNN or MSN have enormous reach in the news SERPs. The typical US domain can publish a fantastic story about a news topic and these powerhouses can publish a short little blurb - the powerful domains get indexed immediately and also rank higher. They get the early traffic and the huge traffic. Then, if the story if expecially hot, writers at the powerful sites can get inspiration from excellent writing at a weaker site, publish an updated version of their story and collect all of the links on the basis of their higher rankings - they get your story line too!
In some situations the excellent writer can be recruited by the gorilla site or a mutually beneficial syndication can be obtained between the owners of the two domains. The powerful domain publishes the writings of the excellent writer with the branding of the lesser domain. This gives the lesser domain enormous branding compared to what they had before but they gorilla gets most of the traffic (and ad revenue).
An interesting example of this in the food area is the introduction of premium coffee by McDonalds in direct competition with Starbucks. McDonalds might have sought a deal to bring Starbucks coffee into their stores but instead decided to reach for the richer unfranchised market.
Edited by EGOL, 10 January 2008 - 07:15 AM.