The very popular Opera Mini has just released a beta version, with significant increase in page loading (tried it on my E61i and it delivers as promised).
Other new features:
Skins - personalize Opera Mini by choosing a new colorful skin
Video - they are working to make video content available on more phones through Opera Mini. If you have a new Sony Ericsson or Nokia phone, the chance is high that you can take Opera Mini for a spin on m.youtube.com.
Sync your Notes - the handy Notes functionality from the Opera Desktop Web browser just got more portable through Opera Link. All of your notes are available in Opera Mini directly from the Bookmarks menu.