http://digital-photography-school.com/how-to-use-leading-lines-for-better-compositions/ This article explains about leading line. It is quite same as traveling path though.
Yeah Gumroad seems to be a popular choice for many sellers of digital content. An alternative is "selz.com". I'm sure there are others like it but I'm only familiar with those two.
Some pencil sketch i did recently,i know its not cg,but will use it as base for digital painting or concept art for 3d modeling... Uploaded with ImageShack.us
I don't own a 360, but the one game thats exclusive that I've always wanted on it is IloMilo. I think it's digital download only but it's a charming puzzle game.
Digital tutors is best for beginners. There are lots of tutorials there. http://www.digitaltutors.com/ There are also learning paths in DT. Check it and it will help to learn step by step. http://www.digitaltutors.com/learningpath/
Damnit, now I have to go being a douche at CGTalk instead, what a hassle. But yeah, don't be a douche overall as this is the digital age and the web never forgets.