You can use this tool to explore the episerver blog dll:

http://www.red-gate.com/products/reflector/

Almost the same as having the source code :), I use it alot myself.

Hi,

The episerver.blog.dll that was released before EPiServer CMS R2 will not work, so you'll need to get the demotemplates that are released for R2.

Also, the dev team has recently setup a symbol server so you can debug against EPiServer CMS. I'm not sure if demotemplates are up yet. However, the address is symbols.episerver.com and you can read more about it in this article:

http://world.episerver.com/en/Articles/Items/Debugging-EPiServer-CMS-5-R2/

Otherwise you could post your problem here and maybe we can help you or contact me and I'll send you the blog code.

Regards Per