I’m not a huge fan yet for using online services for video editing but I know the day will come when the video file formats we are using will be designed with editing in mind…. ooooh look… a little piggy just flew past the window!
Anyway, there are many people out there that really don’t have the need for a purpose built stand alone video editing software on their computer. I came across this list of resources which looks pretty complete.
I don’t really have any experience with many of them but of your needs are modest they may well be worth checking out.