Hey, glad it helped.
Blender does come with its own internal renderer, and there are open source projects that tries to integrate V-Ray into blender. There are links on their website that you can check out.
External Renderers for Blender
More-ever, blender often has many development projects that tie in directly to the development of Blender. In other words, the team at blender and a group of professional artists work together on a production, developing blender to fufill the production needs and integrating the changes into upcoming releases.
There are some open source projects such as:
Elephant's Dream
Big Buck Bunny
Sintel
Blender Open Source Movies
As you can see from the productions above, all of them are rendered using Blender's internal renderer, and it is constantly improving with each revision. One reason I can think of that the youtube videos does not go in depth into the render engine in Blender might be linked to the downside of Blender is that with every revision, there are usually major changes and so it is usually quite hard to keep up with the revisions, although version 2.6 would be the Final version.
Although I have not gone in depth into rendering in blender, but in my opinion, the blender engine, although not as beginner friendly as I hoped it will be, it has much potential to be explored and definitely will improve leaps and bounds in the near future to come.
The one advice would be to head to Blender's forum and be part of the community there. The people there are helpful and they would be the best people that I can direct you to get help from all aspects of blender.
Blender Forums
Just scroll down and on the left there are a huge number of blender forums and resources.
Hope that answers your questions!
*Update: It took me 2 hours to post this reply! Darn forums keep logging me off whenever I click post reply and I had to resort to using Proxies to access my account and post this. Cookies or whatsoever not solutions didn't help either! I blame the forum >

. If you're seeing this Nate, that meant I succeeded though

.