Installing Tor on OBSD3.8

[joe_schmoe]

Greetings

I am contemplating buying the OBSD3.8 CDs and just wanted to double 
check something first before proceeding. I have heard about a program 
called Tor which I think stands for "The Onion Router" - which basically 
anonymizes one's Internet activity (is that correct?). I would like to 
install that on the OBSD3.8 dedicated firewall, so just a couple of 
quick questions:
1. What is involved in installing Tor - any special proceedures or any 
gotchas?
2. Does it have any effect on overall performance?
3. Is my understanding of the function of Tor accurate and will it 
actually anonymize all machines behind the firewall? Would this extend 
to blocking IP addresses, or does it merely mangle the packet headers?

Sorry for my cluelessness :)

Thanks

/j
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