I am new to blogging, What exactly is a landing page needed for ?

[Campbell McArthur]

Just out of curiosity, is there a point in having a landing page when you do not do e-Commerce and actually sell products online? I am just kind of lost as to what to think about this as I see reference about the importance of landing pages all over the net.

With my given scenario, I have a computer repair business which I run every day but want to start blogging heavily because I enjoy technology and I enjoy writing and I also want to start getting out there and designing websites and doing more internet based technology work vs field work and it is a way to get SEO juice with GOOGLE by pointing to my main business site in addition to all of the above.

But I am also wanting to start signing up for affiliate programs Studio Press, DIY Themes, Headway Gravity Forms etc, etc, etc to earn money each month to help offset my tech obsession which is quite expensive. With those things said is there any benefit of me doing landing pages when my actual eCommerce involvement is MOOT?????

Thank you,

Campbell