Apple logo, Google logo, BMW Logo, IBM Logo, Yahoo logo, Nike logo, Pepsi Logo, Toyota logo, CocaCola logo, Harley Davidson Logo are some examples of world famous logos. You would definitely want your company logo to stand in line with these famous logos.
What has made these logos so famous?
One thing that is very obvious in these logos is that these logo designs are very simple. No fancy or complex graphic art work done. But yet they are excellent memory triggers.
http://www.logoblog.org/famous_logo_design.php