I really like the last point about leaving out cool stuff because its not resume material. When learning about resumes in school, it seemed like the teachers would always try to have me recreate the "standard" resume basically from a template because it was the "right way to do it". In reality, a resume is just a way for the company to get to know you and your abilities/accomplishments and as long as the resume is clean and understandable, you should feel free to anything that could help your case.
Yes, exactly. The nice thing about tech companies is that they're very casual, and really not caught up in "rules" about resumes. (That said, many resume rules do exist for good reason.)