I'm totally freaking out right now. I was resizing my partition via GParted on SystemRescueCD and I think I deleted everything on my Linux partition when I accidentally cancelled! Oh my gosh I need that stuff (I don't have an external backup!). My dad has all his students' things on there he needs.

How can I fix this? Grub gives me like error 2 or something. I'm on a Puppy livecd at the moment. I'm freaking out more than I can ever remember freaking out. Please help if you can!

(Kubuntu 7.10, gnome installed too)

You "cancelled" the operation?

If you did resize the partition in question, there was a good chance Grub would not boot the operating system. You would need to reinstall Grub. Your data "should" still be there, hopefully.

If you formatted the partition, the data is gone forever.

Can you access the partition via live cd to see if it still exists as well as data?

The partition itself exists but there is not report (by GParted) of any data. However, this may simply be that it is corrupted and thus can't tell if there is or isn't data.

Oh, that's not good. If it comes down to it you may have to use a liveCD and photorec or foremost to recover what data you can.

What are photorec and foremost and how do I get them?

http://www.cgsecurity.org/wiki/PhotoRec

(Googled)

I used that a few weeks ago, and it seems to work well. Its a shell based application which will recover your deleted items. If you dig through the menu systems you will see a way of customizing your search. This program has the potential of dumping a very large collection of files into a lot of temp folders.

Know that even if your files are not accessible, they are not deleted either. That is the benefit/curse of a journaled file system. When you are using photorec or any file recovery program, remember to save in a different partition, lest you overwrite something you are trying to save.

what does fdisk -l say?

At what stage did you cancel? Just as /after the partition was shrunk or while it was already resizing the file system?
If it's the first, recovery should be easy. Just run testdisk on that drive and try to determine the start and end of the partition as they were before you ran gparted. Then delete the partition, run fdisk and recreate it with the proper end/start. Note that fdisk and testdisk seem to measure differently: the former starts counting from 1 while the latter counts from 0 so you have to add 1 to the start/end numbers reported by testdisk before you can type them into fdisk.
In the other case, things could be more painful and recovery of the raw data may be all that you can do.