Not really sure where to start but I had an ext3 fs mounted as /home on /dev/sdb3. I then attempted to create a swap partition on that running:
mkswap /dev/sdb3 1000000 STUPID!!

I then thought to run fsck but it warned me about running on a mounted file system.
I then issued : umount /home

This has since unmounted it but now I cannot remount it. I think the systems is confused with 2 file systems on it. Please see the following disk stats:

What should I do next to get /home recreated. I'm pretty sure my data is gone but I'm just afraid to do anything else for fear of blowing something else away. Uugh! Help!!!



df -k

Filesystem 1k-blocks Used Available Use% Mounted on
/dev/sdb5 381139 305288 56173 85% /
/dev/sda1 46636 34978 9250 80% /boot
none 579968 0 579968 0% /dev/shm
/dev/sdb1 3020140 992068 1874656 35% /usr
/dev/sdb6 27521840 17024156 9099632 66% /var

mount

/dev/sdb5 on / type ext3 (rw)
none on /proc type proc (rw)
/dev/sda1 on /boot type ext3 (rw)
none on /dev/pts type devpts (rw,gid=5,mode=620)
none on /dev/shm type tmpfs (rw)
/dev/sdb1 on /usr type ext3 (rw)
/dev/sdb6 on /var type ext3 (rw)

fdisk -l

Disk /dev/sda: 255 heads, 63 sectors, 1106 cylinders
Units = cylinders of 16065 * 512 bytes

Device Boot Start End Blocks Id System
/dev/sda1 * 1 6 48163+ 83 Linux

Disk /dev/sdb: 255 heads, 63 sectors, 4427 cylinders
Units = cylinders of 16065 * 512 bytes

Device Boot Start End Blocks Id System
/dev/sdb1 * 1 382 3068383+ 83 Linux
/dev/sdb2 383 636 2040255 82 Linux swap
/dev/sdb3 637 897 2096482+ 83 Linux
/dev/sdb4 898 4427 28354725 5 Extended
/dev/sdb5 898 946 393561 83 Linux
/dev/sdb6 947 4427 27961101 83 Linux


major minor #blocks name rio rmerge rsect ruse wio wmerge wsect wuse running use aveq

8 0 8885248 sda 58 166 448 120 17 10 54 90 0 180 210
8 1 48163 sda1 39 61 200 60 17 10 54 90 0 120 150
8 16 35563520 sdb 137142 341331 3688992 2831030 159173 425951 4062706 20847160 0 2539090 23947020
8 17 3068383 sdb1 4847 2815 60770 19210 1738 4063 46960 31650 0 24760 51080
8 18 2040255 sdb2 3270 0 26160 11040 19037 74047 752824 15381320 0 1109130 15651210
8 19 2096482 sdb3 14865 235285 2000642 89900 28 4 232 20 0 45330 89920
8 20 1 sdb4 0 0 0 0 0 0 0 0 0 0 0
8 21 393561 sdb5 11258 11398 45314 26410 30815 81176 224402 353220 0 67790 379620
8 22 27961101 sdb6 102868 91635 1555642 2684370 107555 266661 3038288 5080960 0 1396020 7775050

Wow well done my friend.
Well, I suggest you start to pray.

You might be able to recover SOME (FEW) to none things. Ext2/3 usually backup super blocks each 8192 blocks. Mean you might be able to mount your partition using some freak options. try to mount your partition using :
mount /dev/sdb3 /mnt/whatever -o sb=1007616
(I'm really not sure if this block make sense neither if your partition is large enought I haven't took the time to count the size of it with the data you provided).
In any case, don't expect too much from it, even if you suceed mounting it, most file will be badly damaged (if you are lucky, only filename will be corrupt) and you'll have to format this again... but you might be able to backup (very) important data you might have. take a look at man mount (especially about ext2/3 options) and feel free to try everything you think of.

btw, DO NOT double post.

you're lucky I found this was a double post AFTER I wrote an answer, double post worth no answer at all.