How to merge two filesystems? Or resize them?

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http://serverfault.com – Any idea how I can merge two file systems on Debain 6? If that's too difficult I'm ok with resizing them, but how? I would like to increase the size of /dev/sda1 and make /dev/sda1 instead smaller. Thanks ;) root@ks:~# mount /dev/sda1 on / type ext4 (rw,noatime,relatime,errors=remount-ro,barrier=0) tmpfs on /lib/init/rw type tmpfs (rw,nosuid,mode=0755) proc on /proc type proc (rw,noexec,nosuid,nodev) sysfs on /sys type sysfs (rw,noexec,nosuid,nodev) udev on /dev type tmpfs (rw,mode=0755) tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev) devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mod (HowTos)