If you want to keep up to date with the latest on the PTR's check these 2 websites every day.
http://www.worldofraids.com/http://www.mmo-champion.com/This way you can plan how many badges, honor, or arena points you want to save up for when 2.3 goes live!
I also like
http://www.wowinsider.com/for general WoW information.
J