I bought a 160GB hard drive and an external USB enclosure and upgraded the MacBook using the helpful guide at The Global Photographer. It’s an easy enough process, and won’t present a challenge to anyone confident enough to upgrade a hard drive in a PC.
I’d hoped the drive would be a bit quieter, and it may be (very slightly) but it’s still nothing like as quiet as my iBook was.
Oh well, at least I’ve now got 116GB free where I only had 42GB before.
And an 80GB external drive. And the total cost was still £40 less than had I gone for the 160GB drive upgrade when I ordered from Apple.