How much life do I have left in my G3 iBook 900 mhz? This machine is only 1 year and 4 months old but I already feel worried about Tiger and future demands on the Hardware. I will upgrade to 640 MB from my current 384 MB but I feel even this will not breath enough new life in my machine! I don't have any heavy application needs. The most I want to get into in the future is to use iMovie and the iLife apps. any thought on the life span of this G3 900 mhz? Is a RAM upgrade even worth it or should I just sell it all together for a G4 system?