Kevin:
I have a question. I have noticed that all my posts have a check in the rating column.
While this makes it easy to find my posts I am not aware that I am doing anything special to place it there. Where does it come from?

I didn't notice it until you told me . It's a built-in feature of vBulltin and must be there since the beginning.

I only noticed another sign at the first column, it is displayed when you participate in a thread. Both signs will pop up a window when you put your mouse over it, but with different information.

OK, my above reply is inaccurate, the check sign means you are subscribed to the thread. Usually when you participate in a thread, you are subscribed to it automatically (this can be changed in 'User CP' though), so normally the check sign are almost identical to the one in the first column.

Ah. OK. So I shouldn't worry about it.