Thank you for getting back to us.
We realize the benefits from open source modules and, in fact, there is an open source project for the Jobs module, provided with the distribution of the Sitefinity product. The sample is available with both the developer and the trial build of Sitefintiy, so please feel free to review it. Although it is not an open source project for the Blogs module, I hope it will still be useful for you.
With respect to the inspection of the source code through the use of reflectors, please be advised that this is in conflict with our License Agreement (http://www.sitefinity.com/purchase/license-agreement.aspx).
If i can be of further assistance, please let me know.
the Telerik team