
Direct2D is a technology included in Microsoft's DirectX multimedia tools. Usually you would only experience the power of DirectX in playing games, but it seems we're finally going to see extensive use of DirectX in office and home use -- the next few months and years will see significant speed-ups to your general computer use and Internet browsing.
Whether this is simply a reaction to the announcement of IE9, or if Firefox had been intending to include D2D support all along, I guess we'll never know. One thing's for certain though, the fast-moving nature of Firefox and Chrome development has played a large part in nibbling away at Internet Explorer's market share.