Valve announced today that Steam will now feature a “Recommended For You” referral service. The service will recommend..for..you…games and DLC that you might like, based upon recent purchases, things you’ve reviewed, and games recommended to you by friends.
There will be a separate “Recommended For You” page, but these recommendations will also show up in your news blotter. Game pages will also have more information to help you recommend titles to your friends, etc.
If you really, really (really?) need more information on this service, I recommend you head on over to steamgames.com.