[lug] Open Source ticket/bug tracking systems?

[Kevin Kempter]

Hi All;

we're going to need a ticketing system shortly. I'll need to be able to 
isolate each customer so they never see any tickets from other customers. The 
ability to assign different departments & login ID's per customer and the 
ability for a logged in customer to search on the status of tickits either 
within his/her dept or across all tickets for their company would be keen as 
well.

Also an easy to use interface for the customers is important.
 
Any suggestions? will bugzilla do all this? 

Thanks in advance