RSS submission question

Hello,

I've done a little searching on the forum, but couldn't find a single thread that really gave me the scoop on RSS submissions. Here's what I understand and what I've found. Can others please add in the parts I might be missing?

RSS submission (such as to FeedAgg) are useful in getting backlinks to my site. Here's how I think it works. These sites publish my feed and so if I've submitted to five of them then each time I post to my site I immediately get five backlinks to my post.

Is that right?

I've found through bits and pieces the following sites that I've submitted to:
http://www.feedage.com/
http://www.feedagg.com/
http://www.syndic8.com/
http://www.millionrss.com/
http://www.badrss.com/
http://www.netimechannel.com/
http://publisher.yahoo.com/rss_guide/submit.php

Aside from these, are there others that I should submit my feeds to?

I think the third part is to submit my feed other more specific places, like in web 2.0 pages. This would have a similar effect, except that the links may roll off after so many posts.

Please help me fill in the gaps or post a link to another thread that already has.