image formats
When it comes to image formats on the internet, it's generally a three-way tie between JPEG [http://en.wikipedia.org/wiki/JPEG], GIF [http://en.wikipedia.org/wiki/GIF], and PNG [http://en.wikipedia.org/wiki/PNG]. Deciding which image format to use is relatively straightforward; you choose
video technology
Next generation DVD formats promise a huge jump in resolution, from the 720 x 480 of standard DVD to the 1920 x 1080 of HD-DVD and Blu-Ray. Additional resolution is always welcome, of course. But it's not free. You'll have to purchase a HD-DVD or Blu-Ray
user experience
This OS X versus Windows XP [http://www.xvsxp.com/] site contains an exhaustive, extensively illustrated 100-topic comparison of these two operating systems. The author tries to be objective, which is admirable, but the extremely detailed comparison is worth reading mostly because it highlights a lot of subtle design differences.