Right column is going away

Some changes.

I have been a little annoyed with how long it takes for the right column to build -- it requires a hit to the DB each time. I surfaced the pings and news feeds in that column because I look at them a lot and wanted people to be able to find them. But, now since you know where they are -- they're aptly labeled Pings and News Feeds in global nav -- you can always find them up there. You can get those blocks (news feeds, pings, subjects) back on the front page in the left if you change your customization options.