I got annoyed by having to minimise and look on a website to work out my arena points all the time, so I made a small add-on which you could use a slash command to calculate it for me.
Really simple to use, just type /arena 1500(your arena rating) and it will show you the points for all brackets, I hope some of you will have a use for this :-)
For some reason I keep getting an error when trying to upload as an attachment but you can download from WoWInterface.com: Arena Calculator : WoWInterface Downloads : PvP/Arena/BattleGrounds