Update February 2021: This post was originally published in 2008. The techniques and tools mentioned here are no longer relevant.
File Conversion Tools
These three tools are web-based resources that can be used to convert videos to variety of formats to download and play on your local hard drive. All three services work on the same basic process, enter the url of the video you want converted, select the file format you want to save the video in, then download the converted file. Vixy.net and Media Converter both let you download converted files directly from their website to your computer. Zamzar requires that you enter your email address and they send you the converted files.

Download and Play
Miro is an open source media player available for Mac and Windows. Miro is kind of like iTunes for user generated video websites. After you install Miro you can download videos from YouTube and other video sharing sites directly from Miro. If there is a particular video producer that you like you can subscribe to the video channel. Each video is saved in your media player until you decide to delete it.
