Some sites don't give enough context in their RSS feeds to help you decide on committing to a full read. New web-based RSS reader prldr skips truncated feeds and shows full web page links in a side panel.
If you've only got a few feeds you normally look through, you'll probably like prldr's colour-coded feed sidebar and won't have a problem with the fairly simple read/unread and date sorting tools. Power users will still find Google Reader a more powerful tool for sorting, searching and controlling large batches of RSS, but it's hard to resist the appeal of seeing the whole story, in its intended context, through prldr. You get to see a better preview of content and skip a click, and publishers get to show you the ads and other stuff they use to stay in business.
Prldr is a free web app that requires an account to use. For a similar kind of full-feed solution for Reader, try Google Reader Full Feed.