Dhaval Faria posted a cool trick which enables you to join the new Windows Live Mail Beta. Here it goes:

1. Log In to your Hotmail Account
2. Go to Options > Change Account Settings
3. In a Personal Settings, Change your Country to United States and State to Florida
4. Save it
5.  Now, dont sign out, and just simple copy the following link and paste it in the same browser window where your hotmail inbox is.

Link - http://by101fd.bay101.hotmail.msn.com/cgi-bin/BetaOptIn?page=option&curmbox=00000000%2d0000%2d0000%2d0000%2d000000000001&a=b9a426ebd4880ad9d14db4b4c55a69f8bb8dea2282102422220030b2b6bb98c8

6. Now you will see a welcome to Mail Beta page, scroll down, and click on Join Mail Beta or Participate button, and you are in.
7. Now simply go back to Account Settings, re-change your Country and State to original one and you can happily enjoy the new Hotmail.

Note: This trick will work only on IE 6.