Many companies would like consistency within their presentations but need flexibility as well because the emphasis for audiences change constantly. Flash presentations provide both consistency and flexibility.
Your Flash presentation will be interactive which means that every presentation can be different. You can show a map, for example, and choose to explore different locations every time.
If a client shows interest in a particular aspect of your work you can go to more detail on that including video if you wish. For others you can stay off the details and keep the presentation generic.
As with Power Point, you can have a commentary so you can send the CD as part of a marketing exercise or you can use the mute button and provide the commentary yourself.