Oh boy… I push almost everything on both of my phones. On my iPhone 5:
Messages
Kik
Gmail
Sparrow
Tweetbot
Riposte
Facebook Messenger
Instagram
Pocket
Fantastical
Instacast
On my Nexus 4, like Dieter I push basically everything. Android notifications are so unobtrusive that I haven’t bothered going in to customize them.
Finally. Metro was way too restrictive for most developers, especially those like Facebook and Twitter that have developed their own mobile UI on other platforms. Allowing them to essentially port the look and feel of their existing apps, while still including some Metro fonts and flair, is a good step in the right direction.