Opera Mobile 10 is now out in Beta form for Windows Mobile.
http://www.opera.com/mobile/
you can get it directly on your handset by going to http://m.opera.com/mobile/
Installed and is now the default browser on my Touch Diamond 2 running 6.5. Set itself up to work from the browser tab straight away too.
Initial thoughts: I like it. A lot more polished than 9.6 was, more touch friendly, more like a desktop browser, does a really good job of Wikipedia something that 9.6 failed at. It takes a little longer to launch than 9.6 did, but it's still beta so fingers crossed that will improve.