This is actually one of the debating points at XvsXP.com, and I think Dan covers this issue very well.
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System:
• 2.5 GHz MacBook Pro Core 2 Duo, 4 GB RAM, 200 GB hard drive, runs 10.5.6
• 1.6 GHz iMac G5, 1.5 GB RAM, 250 GB hard drive, runs 10.4.11 (slightly out of commission at this time)
• iPhone, 4 GB, OS X 2.2.1 |