I actually enjoyed that first link. It presented a large amount of evidence showing that mercury from fillings does make it's way to the rest of the body. However, this is true for EVERYTHING we put into our bodies...and this still doesn't demonstrate causality. The presentation was also full of statements intended to evoke emotional responses like "it's not the right thing for children".
Again, the highest-level of evidence comes from randomized control trials. I have presented one already suggesting the safety of amalgam. I'm still looking for one to the contrary.