Very welcome news regarding IE9.
I think a wise choice. Also note Dean Hachamovitch’s comments regarding flash:
Today, video on the web is predominantly Flash-based. While video may be available in other formats, the ease of accessing video using just a browser on a particular website without using Flash is a challenge for typical consumers. Flash does have some issues, particularly around reliability, security, and performance. We work closely with engineers at Adobe, sharing information about the issues we know of in ongoing technical discussions. Despite these issues, Flash remains an important part of delivering a good consumer experience on today’s web.
Flash will be with us on the desktop for quite awhile. Its prospects on mobile are much more murky.