Feeling for reading salesforce release notes is close what I feel when I am unpacking a shipped gadget, its same excitement to see and feel.
Here are my fav. chatter features from this winter’13 release
Just like Facebook, it allows one to easily create polls that will appear in chatter feed. This would really help, because I previously achieved the same by counting like on comments(venue options in the example below)
Creating chatter polls via the new “Poll” tab
how users will see poll in the feed.
Feed after voting is done
Other Chatter enhancements
New setup screen for customizing Chatter Influence
Post to a selected group or your followers directly.
Chatter desktop got some features from chatter web version like
“Like comments” < I miss that a lot in chatter desktop good add for sure.
View a list of people who like a post or comment
View files attached to comments
Rich media previews for links, here is a how a mashable post will look like on sharing the link
Reporting on chatter activity based on various interesting points like
Only 72 hours worth of history is available in Chatter messenger, if the complete history is available that could be better and more enterprise grade.
Again like facebook, you can see and control who can see your post
Unfollow a record without any activity in 45 days, this feature is good but might be risky sometimes. Salesforce should let users follow as much they want like facebook/twitter, the 500 subscription limit hurts.
Know more about Force.com Winter’13 release here : http://developer.force.com/releases/release/Winter13/