15" mbp, 2.0 1GB upgraded to 10.4.8 about a week ago, started to experience some issues... 1) experience a whine constantly and when I try and play shared itunes vids over the network it becomes louder and oscillates. Loud enough to hear over dialogue at a reasonable volume. Possibly the famous MBP whine, as dl'ing mirror eliminates it. Though this makes me suspect, as I did not have it before. 2) airport acting funky, dropping network completely in area where I previously had 4-5 bars. Does not automatically reconnect to network after reboot/awaken. 3) Most annoying one for me. Every time I try and use pathfinder in adobe illustrator (tool for merging or clipping shapes for the unillustrative) with anything more complex than 2 rectangles, it crashes. Previous to 10.4.8 it worked perfectly. 4) PMTool sucking up alot of memory. Any help would be appreciated.