It's been a year, but I thought I'd give an updated response to Marcus's question. The latest Steam UI uses Direct2D whenever possible. That's about as mainstream as it gets!
Windows 7 beta SDK provides everything you need to build with Direct2D (and other recent additions), but it's Windows 7-only. I've yet to compile and try running binaries under Vista.
Windows 7: Introducing Direct2D and DirectWrite
Dec 03, 2010 at 9:54 AMIt's been a year, but I thought I'd give an updated response to Marcus's question. The latest Steam UI uses Direct2D whenever possible. That's about as mainstream as it gets!
Windows 7: Introducing Direct2D and DirectWrite
Jan 26, 2009 at 7:52 AMWPF 3.5 SP1 Graphics with David Teitlebaum
Dec 08, 2008 at 8:52 AM