Iexbeta.com have the lastest MSN 7.0 Preview.

Here's what they're saying:

Our friends over at NeoWin.net got hands on the new MSN 7, which is currently undergoing some heavy internal testing. Since MSN has already taken down the initial download link, I have setup a mirror for you here... Grab it while it's hot!

MSN 7.0 Preview

Warning: This software is a leaked beta version, which has not been officially released by MSN. Installing it might cause your system to fail!