Opera Mini 4 has been updated. The new release is Version 4.4 According to a post on the Opera Mini blog, there are no visible changes in this version. However the network code has be redesigned which "opens up new possibilities for your network operator to integrate services like free Opera Mini browsing to certain sites". I kinda doubt that Boost will ever use that feature. There are also bug fixes including one for a problem that affected skins on some Samsung devices.
Opera Mini 4.4 is recomended for phones that aren't powerful enough to run Opera 5+ well or at all.
Author: Opera Software - Product Page, Online Help, Forum
Data Connection Required: Yes
Minimum Java ME profile: MIDP 2.0
Screen Size: All
Reported Working On: LG Rumor Reflex, Motorola i776, Motorola Rambler, Samsung Factor
Reported not working on: Qmobile E880, Samsung GT-E2222
The app "Opera Mini 4" (134 KB) is ready to download or send to your phone as filename:"Mini44c".