I removed an ntfs partition I had in my HD and then resized my home partition with gparted to occupy all the available space. The resulting partition is supposed to be 129GB, and gparted/partition magic see that size. But the system does not, and all tools report the old partition size and the same free space I had before resizing. Any idea about how to solve this?

Are you using journaling or is the filesystem ext2 or ext3? Because if you are resizing ext3 according to this fellow http://www.hermann-uwe.de/blog/resiz...ns-with-parted you have to disable and re enable journaling. This is what I think you have to do now, that you have already resized the partition.

First you'd better unmount your home partition.
So try removing the journal from your home partition, lets say it is /dev/sda4, turning it to ext2 by:
tune2fs -O ^has_journal /dev/sda4
Then check the size of the partition or maybe run fsck just to be sure everything is fine, I suppose by now it should indicate correct size. Then turn journaling back on with:
tune2fs -j /dev/sda4

Nothing. fsck reports the correct size, but df reports the previous size. Seems Ill have to format.

use a live cd like system rescue cd or parted magic for all related tasks.

My experience with resizing partitions tells me that this in one of the few times that a reboot is called for. The kernel is working with the partition table that was loaded at boot time. If you make changes to partitions, reboot to load the new partition table.

if it is kernel 2.6+ext3 then you could use "resize2fs -f -p <device path>" to format the partition online without losing data and restarting.