I plan to buy an iPad and am not familiar with the iOS. Can someone please help? I will use the iPad mainly for reading and some light productivity work, requiring Numbers and Pages. Can I buy and install those softwares directly using iPad, i.e. not using a separate 'home-base' computer? It says on the website that while buying an iPad, a mac with OS 10.5.8 or later is required. What is it for? I already own an iBook G4 with OS 10.4.11 and an older iMac G5 using (I think) OS 10.3. Does this mean that I am not able to buy and install new apps using my current computers? Do I need to buy a new mac in addition to iPad?