I think that Google staff is working a lot on Gmail in these days... 
After the previous news segnalation, this morning I've discovered a new addition on Gmail: a built-in RSS Reader, placed on the top of your message list.
The RSS Reader is totally cutomizable (just by clicking the Customize button): you can choose from a big list of predefined feeds or add your favourite feeds by yourself (by placing the feed url on the Search box on the left):
This is a good feature but I think that it's not totally well-working at the moment (I was unable to add certain feeds such as weblogs.asp.net mainfeed).