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RE: exist a plugin can show me the invisible contacts?
Actually there is a way, it's not very good though.
With SPNG u can use the window open notification to check it.
If the contact is online and open ur contact card it shows a msg that he opened a window with u, since u see him as offline then it means he blocked u (or just appear offline).
As u can guess, it's not very good cause he need to open ur contact card for that, and u need to be on the computer to see it (and also ur status shouldn't be busy).
I've found some1 that blocked me that way.
Messenger Plus! 3.61 unofficial Hebrew translator
Messenger Plus! Live unofficial Hebrew translator | 
