Yeah, you read OK, the new Opera Mobile 10 is arriveing with flash support. Now you can see and use many flash sites. Many, but not the all! I'm writting that 'cause at my tests, Opera Mobile 10 can't see and runs on sites with macromedia or it can't display correctly the all content. Even more, you need to click on (tape or touch) the flash content to see it and you'll have trouble with sites that asks you some versions of Adobe flash player! And nor with streamming Opera Mobile 10 doesn't work very fine!
Anyway, it's better than nothing! :)
Download and test it for windows mobile!
Note that you need to enable plugins, from the settings of browser to use flash content.