Mounting raw and qcow2 VM disk images

sudo modprobe loop
sudo losetup -f
sudo losetup /dev/loop0 myimage.img
sudo partprobe /dev/loop0
(kpartx -a /dev/loop0)
mount /dev/mapper/loop0p1 /mnt/image
(e.g: mount /dev/mapper/loop0p1 /mnt1)

Reference
1. http://alexeytorkhov.blogspot.com.au/2009/09/mounting-raw-and-qcow2-vm-disk-images.html
2. http://softwarebakery.com/shrinking-images-on-linux