GParted
This is perhaps one of the best partition editing tools in the world! GParted offers non destructive partitioning and resizing, supporting all of these file system formats: ntfs, ext2, ext3, Fat16, Fat32, hfs, hfs+, jfs, Linux-swap, reiserfs, reiser4, ufs, and xfs. By now you are probably thinking, "This software must cost a fortune!" Well, I have good news for you! GParted is an open source program and free of cost. You can download GParted to install on your Linux box. You can also get a Live CD, and a Live USB version.
Here are some screen shots of GParted courtesy of http://gparted.sourceforge.net.
This is a screen shot of the main window.
This is a screen shot of detailed information of a hard disk.This is a screen shot of progress dialogue.
This is a screen shot of the flagging options GParted gives you.
I just love GParted! I have re sized partitions myself with no problems at all. I really don't think that partition editing can get much better or easier than GParted.