There are many types for nerdism and TV ARK is one type that even puts normalism into nerdism. This site covers the TV ident and promo part. TV ARK site is an online television museum. Here you can watch idents for all of the bigger tv channels in the world. Here they present idents from the very beginning for channels like NBC, CNN, BBC, Sky, Super Channel and Screensport to just name a few. You can also see the history for Scandinavian TV channels also.

So! If you love idents, then TV ARK website is the place to be:
TV ARK Website

Browse around. I am sure that you will get the nostalgia fully after a while browsing this site.