I'm not sure what your website is providing but I would imagine that a screen capture video demo works best most of the time as it allows you to showcase your p

I'm not sure what your website is providing but I would imagine that a screen capture video demo works best most of the time as it allows you to showcase your products nicely. For this on the Mac you can use things like SnapzPro and MousePose (take a look at the Firebug screencast). I'm not aware of any companies to use for a full production video. As far as tools go you can probably use any decent camcorder, a tripod (handheld video doesn't look very professional) and some video capture software. There are plenty of options depending on your platform. Once you shoot your video however it should be very easy to outsource the editing if you're not comfortable with it. You can usually find talented individuals in other countries willing to do this cheaply (ask for samples, etc).