Facebook announced today that they we be making big changes to the Facebook messaging systems. Those who currently use Facebook would know how clunky their current messaging system is. Facebook say that they will integrate all your messaging and give you a facebook.com email address.
These changes will be progressively rolled out via invitation. With over 500 million Facebook users it may take a number of months before we all see the changes. I will wait until I can get a chance to try it before making any judgements. For further information I have included a reference to the Facebook blog post announcing it.