This official guide should help you.
iOS: Importing personal photos and videos from iOS devices to your computerhttp://support.apple.com/kb/HT4083
If you have some non-personal stuff for transference, here's also a video guide for you.http://www.youtube.com/watch?v=lDVtLpWWjrs
Thanks for this! I've found and saved the file as you explained, and I've downloaded the software, however I can't see how I upload teh file into touchcopy - can you help? I've tried right clicking on the file, open with and choose touchcopy, but it just keeps looking for my iphone. Thanks!