Hi I want to enlarge my ext3 partition (to the left). How can I do this? I tried QtParted but the resize command is disabled for ext3.

If it is disabled for ext3, try mounting it as ext2 (it is possible), then resize, run tune2fs -j to convert to ext3 again and mount as ext3.

But all the partitions need to be unmounted to use qtparted!

OK, I have an idea, somebody tell me if this wouldn't work:
1. Make an image of the partition with Partimage
2. Delete the partition
3. Make a bigger one in its place
4. "Restore" the partition from the image

I have just doubled the size of my root partition.
First made a tar dump of it on another disk. If you do not have 1 2nd HD dump to CD or DVD if possible.
booted up with rescue CD.
Deleted old partition with fdisk. Then remade it 4GB was 2GB.
on /dev/hda2
made new filesystem in my case mkreiserfs /dev/hda2
mounted new partition mount -t reiserfs /dev/hda2 /mnt
cd /mnt
tar -zxvf /disk2/dumps/server.taz
I use grub to boot so it did not need to be rerun.
I hope this gives you some idears.

That's pretty much what my idea was except I would be using Partimage instead of tar and QtParted instead of fdisk... so I guess that's what I'll be doing.

Um, it worked, I think...
If I go into QtParted (on rescue CD), it shows that the partition is big... but df (from CD or from my system) says it's still small! Why??

Resizing the partition is half the job and resizing the filesystem to fit the new partition size is the rest of your job. That is done with the resize2fs command while booted up in the rescue cd.

For example....
If you enlarged /dev/hda2 , you need to resize the filesystem to match....
In this case, because you are enlarging the filesystem, you can leave out the size argument and let the command automatically resize correctly.
e2fsck -f /dev/hda2
resize2fs -f /dev/hda2

If you where going to shrink the partition size, then you need to shrink the filesystem first and specify the size which you want it to be.
For example..
e2fsck -f /dev/hda2
resize2fs /dev/hdb2 8000M will set the filesystem size to 8GB inside a partition. Then I would recreate the partition and re- run the resize command with no size argument to make sure it fits correctly.
e2fsck -f /dev/hda2
resize2fs -f /dev/hda2

Oh I see... Well thankyou, I did what you said and everything's good now.