Chinesedisc @ Kel'Thuzad US // arenamate

Name	Provider	Purpose	Expiration
JSESSIONID	arenamate	Keeps track of your session across the site during your current visit and makes sure to keep you signed in.	When you close your browser.
am-region	arenamate	Keeps track of your region setting for filtering across the site.	Never.

Name	Provider	Purpose	Expiration
_ga	Google Analytics	Used to distinguish users.	After 2 years.
_gid	Google Analytics	Used to distinguish users.	After 24 hours.
_gat*	Google Analytics	Used to throttle request rate.	After 1 minute.

Name	Provider	Purpose	Expiration
__gads, __gac	Google AdSense	Serve purposes such as measuring interactions with the ads on that domain and preventing the same ads from being shown to you too many times.	Varies.