I've got a hoary old G4 Powerbook, and have been holding off on updating. At this point, though, the battery craps out in 45 mins, and the inability to burn DVDs (it's combo drive), run Snow Leopard or pre-Intel apps, fading screen, low RAM, and slow processor are getting to me. I don't like to upgrade until the need is great, but I've pushed the mantra to the wall here. And reading other threads and comments here, it seems I'm hardly alone. Damn, Apples' going to sell a lot of MBPs if there's a major revision! So here's my plan. Buy a MBP 2.53GHz immediately. Hold on to my powerbook. Then, as soon as Apple announces its next event (and the stars seem right for Arrandale), sell the MBP, so I can get the most $$ for it (figuring its value will drop AFTER the announcement), and revert to my powerbook until the new models are available. If the new models are a really radical update, consider sticking with the powerbook for a few more months until the first rev appears to address any problems. And don't install Snow Leopard on the MBP, because that will make it hard/impossible to retrace back to the Powerbook. What are others thinking?