THIS!!! It looks real, but will result in your losing your account.
What the email looks like:
World of Warcraft: The Cataclysm™ Alpha Test
Congratulations! You have been selected to participate in the alpha test of World of Warcraft®: The Cataclysm™.
In the alpha test you’ll get an opportunity to test the first zones of the new continent Maelstorm and the new levels above 80. We look forward to your feedback on the overall experience including quests, monsters, zones, aesthetics, and more. We would also appreciate reports on any bugs you may encounter. These can be logged using the /bug command explained below.
Getting started:
In order to participate in the alpha test, you must upgrade an existing retail account that has been upgraded with the Wrath of the Lich King®, allowing you to connect to the The Cataclysm alpha test realms. The World of Warcraft®: the Wrath of the Lich King® game client that you use must be patched up to version 3.1.2 or later in order to install the alpha test client.
Please be prepared to enter the current retail World of Warcraft account name and password you use, and the appropriate information to authenticate your eligibility to connect to the The Cataclysm alpha test realms. To participate in the alpha tests, you must have a valid retail World of Warcraft account active and in good standing as of August, 1st 2009.
Please visit http://www.worldofwarcraft.com/cataclysmalpha.html to upgrade your retail World of Warcraft account to alpha testing status and take part in the alpha stages of the new expansion. Please note that this will not effect your ability to play retail World of Warcraft.
Your Cataclysm Alpha Key:
0765-54672-56129-09845
*****************************************************
Sending us feedback:
Typing /bug in chat will open an error reporting interface, and we encourage you to use it any time you encounter a problem or want to send us a suggestion. Troubleshooting:
If you experience any difficulties installing the alpha game client, or have problems connecting to the test realms, please contact Technical Support either by posting on the appropriate forum at World of Warcraft – English (NA) Forums -> or by email at wowalphatech@blizzard.com. Please remember that this software is still undergoing development, so any in-game issues should be reported using the /bug feature.
Sincerely,
Alpha Testing Team
Blizzard Entertainment
The page linked takes you here, which is a total redirect and nothing to do with Blizzard at all:
After you enter the ALPHA key given, (or any numbers at all) it takes you on to this page which is where your account information is snagged and you lose your account:
That sums it up. NEVER click things you do not 100% trust. If you are a customer of TGS.net please drop into chat and ask us for our opinion or assistance if you are not sure.