Monitoring database

Hello everybody.
Is there any way to check database status, or who is currently connected to it.
I tried to drop database and got an error saying that other users using this database.
So I wanted to see who is connected right now to the database.

One more question is how can I see all tables in the template1 ?
Thanks allot.

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 Roman Gavrilov                           
 Aduva Inc., Web Development Services.    
 work +972-3-7534324 mobile +972-54-834668
 romio@aduva.com, romio@netvision.net.il