I just sent my 600Mhz iBook back to Apple because the logic board has failed. This makes the second time. The rep on the phone warned that the depot was running low on stock of the new logic boards and that it could take up to 21 days to get my iBook fixed. Well, I sent it off last Thursday and got it back today. Talk about turn around, and Apple upgraded me to a 700Mhz G3 and Mac OS 10.3! Anyone else experience this? I was very shocked.