Erik, The native format the Sony HDR-SR11 to records HD in is AVCHD (a variety of MPEG-4/H.264 compressed in the camera). Presently, Apple claims you
must use an Intel-based Mac to edit this footage, because iMovie first has to transcode it to Apple Intermediate Codec. I have not heard of anyone editing AVCHD successfully yet on a G4 or G5 PowerPC processor.
Ratnob, check the version of iMovie you're using and run Software Update if necessary. I'm using 7.1.1 on a 1.4GHz Intel Core 2 Duo iMac. If your MacBook Pro is Intel-based and you're using a functional USB port to connect to the camera, there's no reason it shouldn't work. This may be obvious, but check the following (not sure how much you've already tried, so I'm throwing out the kitchen sink):
1. When you connect the camera to a USB port, Make sure iMovie 08 is open. Does the camera ask you to confirm USB Connect Mode? If not, chances are there's a problem with the USB port. Even if iMovie won't recognize the device, the device should detect that you're trying to hook it up to a computer and prompt you to establish the data connection at the touch screen.
2. I seriously doubt the camera is sensitive to the power output of your USB ports (it has it's own battery, after all), but on the off chance it matters, try plugging it into different ports with and without the AC Adapter connected to the camera.
3. Plug
directly into the PowerBook's USB port -not a hub.