Online advertising techniques series

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As all have been noticed there is absolute paranoia about World Economic Crisis... There a a lot of side effects of this phenomena and every excuse due to incompetence has same form. Lets stop on this.But...
market research group IDC said Wednesday that Internet advertising could fall by 5% in the first quarter of 2009, the first contraction in online ad spending since the dot-com bubble burst in 2001.
There are a lost of discussions going on on this topic and a lot of sensationalism. Some blame global factor and fact that US citizens have no more money to waste tocriticism of whole concept of online advertizing.
Online advertising is something I’ve thought a lot about, but I don’t fully understand.
This series of articles will point to main online advertising techniques in order to sublime knowledge and create main conclusions.