Reverse engineering is a very broad topic, but here's a bit of a technical tip:
If the blogs are Wordpress-based, you can try to look at the html code and see if there's any mention of a plugin that might give part of their secret away.
Let me explain:
If they have Wordpress-based blogs that are automatically updated with content, then maybe there's a plugin that operates that autoblog function.
Virtually every web page has code behind it. (On FireFox, on a Mac, do a right-click and select View Page Source.)
You can look through the code for any mention of a plugin that might pique your interest. Then, search for the name of that plugin on Google and see what comes up.
That's one tip that I hope leads somewhere for you.