One question, doesn't the Flipshare software with your camera allow editing of your movies and uploading to YouTube etc.
I'll leave it to others to suggest freeware - I've never found a program which is not restricted in some way.
I use a commercial program, Roxio, not to everyone's taste.
I believe that one of the better programs is Sony Vegas:
Not free, but the basic program is quite reasonably priced and may just be suitable for your needs.