YouTube and Google Video are two of the best known video sharing sites and both provide simple video conversion to the FLV format when you upload your video clips to their sites. We then provide a tool that allows you to link from a video player in your site to your video. Your video is still hosted on YouTube or Google Video but it will display within a page on your site. Having it hosted elsewhere also ensures that you do not exceed the storage and bandwidth limits on your SiteMaker Site.
Alternatively, you could do a web search for the term, 'FLV converter' or 'video to flash conversion' and find your own converter that will convert various video files (MPEG, WMV, AVI etc) to FLV files. Free converters are available on the web for both PC and Mac, and all should come with adequate Help or User Guides.