oEmbed module allows the easy embedding of third party videos using the Link field (from the Link module). One small problem I had was that I wanted to show listings of oEmbed videos, but as thumbnails instead of videos. This module creates a simple field formatter for the Link field called oEmbed Thumbnail that can use any image style and can also be used in Views. Simply enable it, visit the display fields settings page for your CCK field and change the formatter. In Views, simple change the field formatter also.