Tried it. I have to say that the experience was not good. It was hard to figure out what buttons to push to enter addresses etc., and when I finally did enter addresses it was painfully slow. I'm a big Opera fan too so this was very disappointing. One plus side though is the small screen rendering is awesome. Hopefully Opera will release an official BB optimized version.
I asked over at the Opera Mini forums about what happened to Blackberry support. If you want to see Opera work on your BB, chime in over there:
http://my.opera.com/community/forums....dml?id=121042
[Edit] Someone from Opera chimed in saying that the BB was never a supported device, so it was nice that someone had found a cached page.
[Edit 2] Well, hopefully they'll support the BB in the future.