Still trying to keep up as Google Reader morphs into a global discussion group; it may eventually need some kind of killfile capability on username since there’s no control over what is shared or commented. It could be Usenet Wars or Listserv Wars all over again.
But other than those minor concerns, it’s very cool seeing so much interesting shared content. I mostly read via iPhone app, which lacks the Like and Send To buttons, but if someone can point me to the appropriate Javascript for those, I could save it as bookmarks in Safari and add it to Bookmarks. I use that trick to send URLs to Twittelator and also to del.icio.us.