For research into existing idents I searched YouTube.com for videos and found an abundance of videos. For example idents have existed on channel 2 since 1964 which can be seen in the following video.
Channel 4 have recently made a number of idents where everyday scenes and objects are arranged so that when the camera pans, the channel 4 logo can be seen from a certain angle which adds a subliminal factor to the design. The following video is an example of just one ident.
Here are some screen shots of the channel 4 idents where the camera views the logo through its panning.
