One of the better new features is being able to embed youtube videos directly in posts. Just copy the embed code next to the youtube screen you are watching and paste it into your post. See pic below
When adding photos to posts you still use the manage attachments feature but the images are displyed as medium thumbnails and when clicked pop up full size. Multiple posted images behave like an album with next and previous buttons.
You can modify your personal profile appearance and content.
You can create new connections, groups, photo albums, etc. using the options under the community button on second navigation bar above.
More as I find them....
oh yeah, my favorite, I modified this guy
to this guy
for when the racing fun turns fugly....