I was browsing last week when I came across Partition Find and Mount from Atola Technology: it’s a utility to mount a lost partition as a drive.  Nice for botched formats, failed boot sectors and the like.  This led me to their main site and a bunch of other extremely useful hard drive and file recovery programs.
Atola Technology

I’ve mentioned GParted before as an excellent free partition manager.  HowToForge.com has posted an excellent walk through to get the hesitant started.
Modify your partitions with GParted without losing data

While this is written for Linux the creators of GParted have a Live CD version that works very well.  I suggest you know what you’re doing with partitions before you get into this, but GParted does everything you would need to do for hard drive partitioning, without buying Partition Magic.
Gnome Partition Editor