I just wanted to point you towards a series of video courses I have created for Digital Tutors. These range from character modeling, to vehicle construction and both high and low poly.
They are primarily Silo based, but the Subdivision Surface processes can be easily followed in any application.
I have attached links below, so feel free to have a look and let me know what you think! Also, if there is anything you would like me to cover in the future please also let me know.
As always, more info can be found at my web site too
Hope you enjoy them, and feel free to share these links with your friends!