Ajax - The next killer app that is revolutionalizing the web. Google has already implemented this in Gmail and GMaps (Google Maps), and this could be used for future thin client applications like Office applications on the web...<Read More>. More details on Ajax.
And yesterday I read an article in Wall Street Journal about Symbian (Most of the Nokia phones use their OS) striking a deal with Microsoft for the synch software with Exchange. They are arch-rivals in this business and already RIM (the maker of Black and Blueberries) is showing slight signs of a battle with it's stock. Not sure how the other top players would react to this (PalmOne, maker of the Palm PDAs and Treo Smartphones, is one of them).