I love the new MacBook, and since my PC is on it's last legs, I would love to buy the new 2.4ghz. But what is going to come out in 3 / 6 / 9 months that is going to make me completely regret buying this?
Helps!
The only major things likely to come out within that timeframe is the next version of Mac OSX Snow Leopard and maybe some updated desktops based on the new Intel Nehalem architecture. If you bought a Macbook now you could always buy the new OSX when it comes out, so that's not worth waiting for. Nehalem on the other hand could be worth waiting for if you push your machine to the limits and need faster frame rates for your games or faster number crunching. But if you don't need any of that, go ahead and get the Macbook while it's still near the beginning of it's cycle so that you get maximum use out of it before "the next generation" ones come out.