Hi.

If you are trying install python-simplejson, then you aren't doing it the right way.
The user shouldn't know what python-simplejson is and specially shouldn't try to install it manually.

If you install Sharepy from the Application Manager, then it will install all necessary dependences automatically. You shouldn't see python-simplejson.

If you have problems with it, there could be some package half-installed or similar and it doesn't let you install other applications. Do you can install other apps different to Sharepy? What is in the application manager log? You can get it from the menu->Tools->Log

Also, the 0.0.1 version of simplejson could be the cuprit. I don't know from where is coming it. But seeing the version number I'm not trust the interior of this package.

Finally, the Extras-devel repository shouldn't be in your catalog list. Extras is the repository the users need. Extras-devel is for developers and testers.