If you have a .Mac account you can put a video from Final Cut Pro online with iWeb in a few steps. This is a great way to allow a client to preview a video without much effort. Making the site secure for only the client to be able to view the page is as simple as setting a login and password in iWeb before publishing.
To prepare a video for iWeb with Final Cut Pro, use the Quicktime Conversion Export option in Final Cut Pro. Selecting the iPhone Format option will compress the video to a 480x360 mpeg4 movie. The other preset mpeg4 format option in the Quicktime conversion is the iPod seting, which will output a 640x480 mpeg4 movie. Both of these options will produce an iWeb compatible video.
Starting a New Site with a blank page and dragging the MPEG4 video on the page is essentially all you need to do. It is very typical that you will get a warning saying that the file is too large, but I have yet to not be able to upload a video. There are a few minor options like adding the password protection that you can do, but for the most part all you have to do is publish the site to your .Mac account. If you intend on leaving the page up for a while you can set a domain to point to the .Mac link.