Funny you should mention the word Aggregator - check out:
http://rss.blogstreet.com
Info Aggregator is an RSS-to-IMAP service. It lets you receive and read RSS feeds in your favourite mail client. It delivers all the latest news and blog posts directly to your mailbox.
Now there is no need to go to the blog homepage everyday to check what's new. You can read the feeds from anywhere, even when not connected to the internet.
Plus there is no need for a separate application like a RSS News Aggregator. Your current mail application acts like the Newsreader. Therefore you can start right away, no learning curve. Deal with the feeds like you do with mail.
I assume you'd be able to use it with the builtin IMAP client?