I finally got to try the BlackBerry Bold, and the new browser is definitely a big improvement -- but AJAX is still buggy! Hope this will be improved soon.
One thing in particular: Sprint Captioned Telephone (for the deaf) from www.sprintcaptel.com
almost works properly, but the incoming real-time captioning text that's pushed over a constantly-open connection, is not arriving. However, the conversation was functioning in the background. The iPhone does this one fine -- so hopefully the next iteration of the browser will be able to work properly with this. As I am deaf, this is an important application to me...
And finally -- ability to set font size to 2 or 3 points and still be readable. (One reason I used Opera Mini over BlackBerry Browser, is the BlackBerry Browser could not allow me to use minimum font sizes smaller than 6 points)