If oyu go to the trackable home page at http://www.geocaching.com/track/default.aspx
you will now find a link to look up trackable activation codes.
For those of you trying to get the TXGA Black Sheep codes but are having trouble due to the TXGA website mess, you can get them there now!
In other news.....
With today's update, each cache now has a "Personal Notes" section where you can keep brief notes about a cache. There isn't much space for much info and it doesn't come with your GPX data yet, but OpinioNate says it is just the first step to much more functionality.