..
as of now ext4 looks impressive .
I have a 500GB hard disk . (7200.11)
backed up all my data on identical drive i got from my friend .
speed it showed was 53 Mbps
which slowed down to 39 Mbps as the transfer neared its completion .
total data transferred was over 250GB .
both drives were ext3.
after formatting in ext4
i copied back all my data , getting speeds starting from 80Mbps , and actually going upto 89Mbps .
here source was ext3 , destination was ext4 .
also bootup is faster .
Graphic seem smoother on intel IGP.
HD seems to make very less noise on ext4 .