Do you know that? Elance receives half a million visitors a week. That's more than the Great Wall of China and Notre Dame de Paris combined next

Explain about Blackberry Operating System.

Research in Motion, a Canadian company provided a proprietary operating system for BlackBerry. 

The operating system provides support for Java MIDP 1.0 and WAP 1.2. 

The current version supports Novell Group Wise and Lotus Notes. 

Third-party software can be developed using BlackBerry APIs as well, with certain restriction functionality must be signed by RIM digitally, so that it can be associated to a developer account.