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Yes wait. Leopard will be installed as soon as they announce it's shipping.

No, that is not true.

Tiger didn't ship on all Macs when it was first released... only the PowerMacs (then). I think it was a week or two until it was installed on everything (iMac, iBook, PowerBook, Mac mini).
 
I'd say that with 99% of all consumer electronics, if you have the luxury of being able to afford to wait, you definitely want to exercise that luxury.
 
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