I recently read an article in the lessons section that I found very interesting (http://www.ultimate-guitar.com/lessons/chords/what_chords_are_in_what_key_and_why.html) and I want to make sure I understand what it's saying correctly.

In D major, the chords are D maj, Em, Fm, G maj, A maj, Bm, and Cdim.
In B minor, the chords are Bm, Cdim, D maj, Em, Fm, G maj, and A maj.

Is this correct? If not, could you tell me the correct chords for those two example keys?
That is not correct. The theory sticky covers chord construction.
Someones knowledge of guitar companies spelling determines what amps you can own. Really smart people can own things like Framus because they sound like they might be spelled with a "y" but they aren't.
My bad. I forgot to write the sharp thingy. I will look at the sticky again - I must have missed something there....