Since im kinda new to macs I don't know anything. But what I noticed was that when 10.3 came out, a lot of things and programs became compatable with only 10.3.(and maybe 10.2.8 on some) But now that Tigers comin out, wiill the same thing happen? I don't want to have only like a couple new programs or games work with my G5 running 10.3.8.