Jon S. von Tetzchner announced his resignation from Opera in an email to Opera employees. The founder cited differences of opinion with the Board and Management of the company as his reasons for leaving, and TechCrunch reports that he has other projects he is working on.

Opera has launched a mobile app store called Mobile App. It will be a Speed Dial link in the Opera Mini and Opera Mobile browsers will offer applications for BlackBerry, Java, Symbian, and Android. The number of apps available for download will vary according to the mobile OS you have. Opera used Appia to build their mobile app store. Appia offers about 140,000 apps. [GigaOM]

Desktop browser Opera 11 was released last week and the company had an interesting number to report about it. The Opera 11 browser was downloaded 6.7 million times in 24 hours. Opera 11 has browser extensions support and new tab functionalities.

Opera’s browser for mobile devices, Opera Mini, hit 76.3 million users last month. After their iPhone application was approved, they saw about one million downloads on the first day. About 41.6 billion pages were loaded in Opera Mini last month, generating in 616 million MB being consumed. Opera revealed these numbers in a report that monitored usage. [TechCrunch]

Opera has acquired webmail service company FastMail.FM. FastMail.FM started about 10 years ago and will continue to run and grow their email service. “Joining together Opera’s expertise in web browsers and especially the mobile market, and FastMail.FM’s expertise in email, will allow us to grow and take on the next big challenges in running and building an email service,” said the FastMail.FM in a statement. The terms of the deal were undisclosed. Opera has about 55 million users of their desktop browser and about 55 million users of the Opera Mini browser.

Opera Mini was at the top of the Apple App Store and featured across 22 countries when it launched. As a result the Opera Mini browser application was downloaded one million times on the first day. Below is the full press release.

Opera has finally received the green light for a new iPhone web browser. The mobile browser, Opera Mini will work for the iPhone and iPod Touch.

1. Google gave us CADIE, upside down YouTube videos, and GMail autopilot.
2. TorrentFreak told us that Warner Brothers plans to acquire The Pirate Bay.
3. Arrington announced that he is looking for a date from readers and that General Mills has acquired CrunchGear.
4. CenterNetworks announced the CN51 Startup Conference.
5. SocialBlade claims they cracked the Digg algorithm.
6. The Guardian claims they are killing print version of their site and is going Twitter only.
7. Woot.com is selling a bag of crap for $3.00 and $1 million shipping.
8. Opera announced face-gestured web browsing.
9. Car and Driver is reporting that President Obama wants “a complete withdrawal from America’s premier racing series is expected to save more than $250 million between GM and Chrysler, a substantial amount considering the drastic measures being implemented elsewhere.”
10. Qualcomm stated that their convergence program has implemented tiny base stations into thousands of pigeons. They also stated that these are no ordinary pigeons but a hybrid wolfpigeon.
11. SlideShare told their users that they are Rockstars.
12. Funny or Die wrote that they have been acquired by Reba McEntire and is now called RebaOrDie.com.
13. AOL Radio was considering playing Rick Astley’s Never Gonna Give You Up all over AOLRadio.com.
14. Amazon.com launches brand new cloud computing service called Floating Amazon Cloud Environment (FACE).

More to be added as they are discovered…

These were all good, but I think out of all them, Reddit had the best April Fools prank. They replaced their entire user interface to look just like Digg as you will notice in the above screen shot.