Opera Mini just went up to v4.2, in beta form at least, with new Skins support, faster servers, compatibility with the mobile version of YouTube and Opera Desktop note syncing. Opera also announced that Opera Mini is being used by 20 million unique monthly users worldwide. Read on for more.

From the Opera Mini beta web site:

Opera today released a preview of Opera Mini 4.2, the newest version of the world's most popular mobile Web browser that works on almost every mobile phone. With this beta release, Opera celebrates Opera Mini being the browser of choice for more than 20 million unique monthly users worldwide. As part of the celebration, Opera Mini users in the United States and Asia-Pacific region can now experience faster browsing speeds, due to the addition of an Opera Mini server park in the United States.

Opera Mini is available to download for beta testing at http://www.operamini.com/beta/.

New in Opera Mini 4.2 beta:

• Skins - Personalize Opera Mini by choosing a new colorful skin. We have reintroduced the popular skinning feature from Opera Mini 3.
  
• Performance - Opera Mini 4.2 can use our newly established server park in the US. This means significantly faster page downloads for our users in the Americas and Asia-Pacific region. Users in the rest of the world will also experience faster page downloads since we’ve reduced the load on our other servers.
  
• Video - We 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.