Video Search Engine - (1) Web-based - Video search engines allow you to type words into a search box, as you would into a standard web-based search engine box (field). But rather than getting back web pages, you get back videoclips, audioclips and/or full video programming with related text.
www.searchforvideo.com
http://video.google.com
www.blinkx.com
http://video.search.yahoo.com

(2) EPG/IPG & DVR-based - Using the interface provided by your network operator to interactively search for programming, scheduling etc.