Ubuntu 10.10 installed from windows 7: how to expand drive?

I'm new to Linux. I've installed Ubuntu 10.10 from Windows 7. It's not in Virtual PC, it is independent. It uses a virtual drive in c:, I have chosen it to be 10 Gb. Now I want to increase the size of this drive. How to do this? I've configured the system for PHP MySQL and installed a lot of software and fixed wireless connection problems a lot of things i don't want to loose these things and start troubling again. I heard of backups, but I think it will take too long. Is there any other simple and fast way?