Don't rely on rss feeds as your sole source of content! I'm currently helping two NP members who did just that (autoblogs) and had their domains dropped from google. Both are doing re-inclusion requests as a result.

It clearly states in their webmaster guidelines that such sites are a no-no. "Purely scraped content, even from high-quality sources, may not provide any added value to your users without additional useful services or content provided by your site"