Ok People...
There are tons, and tons of threads about whether or not this is the time to buy a Powerbook, iBook, ect. My advice is to buy, Here's why:
1. You will get a good 3-5 years out of it before Apple starts actually selling, shipping, and getting the bugs worked out of the Intel Macs.
2. Because there probably won't be an update for the Powerbooks; The new ones were just released in Feb. It could happen, but most likly won't.
3. Do you really want to hold out for a year?
4. The first rev. of Intel Macs will most likly be either A. Buggy, or B. Slower, or just as fast as the PPC macs now.
5. Because Apple is going to continue updated OS support for a while. They have set everything up so that they can compile their OS for both PPC and x86. Don't sweat it, Uncle Steve's got your back.
So, with that said, I just want to let everyone know, I took my own advice and just bought a 12 inch Powerbook with a SuperDrive. I love this computer to death, and I've only had it 10 hours. It absolutly rocks my world. I suggest buying one ASAP, get your money out of it, and save up for the new line of Intel Macs, but wait for the second rev. It will be worth it.