Y!M and MSN to talk to each other next year!!

This must be the Web/Tech news of the month. (Well, the first piece of news that qualifies for the news of the month award anyway. More about the second piece of news later.) It has been announced that users of Yahoo! Messenger will be able to talk to the users of Windows Messenger come next year. Finally, there is no need to download and register an extra messenging client. However, I am getting a bit paranoid about this. The reason I haven't been using MSN is to avoid spam and virus/worms. So now will I get infected through Yahoo!? Maybe it's time to move to Google Talk...