I was re-reading my post and parts of it were not very clear (it comes across like I'm an intellectual property hating communist :) ), so I thought I'd put it in a Q&A format to clarify my position.
Please, please remember that I am NOT a lawyer, so I could be totally wrong here. The authoritative source would probably be this guy.
[Someone who commented on the previous post (anonymous) pointed out that content is All RIghts Reserved by default, and he (or she) is correct. I'm going to ignore that for the time being because if we assume All Rights Reserved on RSS feeds then you would need to get into a contract with the author before using the feed and the whole concept of RSS would collapse. Either that or I'm totally wrong. Maybe someone can explain]
This is my (limited) understanding of the legal standing.
Q. Can anybody just put my posts online
A. If you have an RSS feed, it means you want your content syndicated. I would think then its OK if people syndicate your content.
Q. But it's not attributed
A. It doesn't have to be. You are providing the RSS file. It is up to the syndicator to then do display sections of it as they like.
Q. I want it to be be distributed by also to be attributed to me
Q. I want it to be used non-commercially
Q. I want to place certain rights on its usage
A. Affix one of the Creative Commons licenses, or maybe one of your own licenses to the RSS feed. It's your feed, and you can attach whatever conditions you want to it.
Q. I've attached a license, but he still copied my stuff
Q. I've got only excerpts on my RSS feed but he's showing the entire post
Q. I've not got an RSS feed. He's copying from the website!
A. I guess you can go after him now :)
However, and this is the central point I'm trying to make, even leaving aside the legality of the whole thing, it doesn't really make sense to go after him so hard. Lets assume that what he is doing is completely illegal. He isn't slandering you, he isn't stealing your profit, he isn't cutting into your viewership, he's just running his blog on his corner of the Internet (with your posts :) ). It was just a random search that led to his blog. Now, if he were to steal all your viewership, or had some other malicious intent, then the case would certainly be much stronger.
It's like the grumpy old uncle evicting the kids who are sitting on his lawn. Sure, the uncle owns the lawn and is totally within his right to evict the kids, but it still leaves a bad taste in everybody's mouth. Maybe it just disturbs me, because I am used to the openness of the Internet. Why be a bully to someone who isn't even harming you?