There are plenty of formats you can display the video in: WMV, MOV, FLV, etc However there are a few things you need to think about as it
Depends on your audience:
Do they more than likely have the most up-to-date versions of various software (Windows Media Player, Flash, Shockwave, QuickTime, etc.)? If they didn't, would they most likely be ABLE to update their browsers (ie, not my 90 year old grandmother). How large is the video file? Do you have the capability to encode in various formats to reach more people?
As far as displaying the video, try to keeep the file size as small as possible if you can.
You can either dislay the video by linking to it in a browser window or you can emded it. this code works with a WMV file... not sure about the others:
Code:
<embed width="320" height="240" src="file.wmv" align="middle"><noembed>Windows Media Player Required</noembed>