If you would like to export SmartObjects from blackpearl, there are two ways.

K2 Object Browser in Visual Studio

The trick here is that you have to have a k2 project open. Once you have the k2 project open, browse to your SmartObject and right click. You will see a menu appear with 'Save to Local'. The only problem is that it will add it directly to the project you currently have open in Visual Studio.

Amazing K2 SmartObject Tool

This is a great tool that is available from the k2underground (Available here). In the 807 build it will be located in the bin directory (Thanks Anthony). It was apparently developed by Janus (one of the brains behind SmartObjects in the k2 product team)

Just open the tool, browse to your SmartObject, right click on the SmartObject and you will get a menu to get to sodx file. The nice thing about this tool is you can also get the xml, execute the SmartObject, and delete the SmartObject.