In an attempt to help parents feel more at ease with their children's online computer use, Microsoft has produced A parent's primer to computer slang, wherein the intricacies of l33t are explained. There's something unsettling about seeing intentionally edgy computer slang described in such staid terms:

Rules of grammar are rarely obeyed. Many leetspeekers will capitalize every letter except for vowels (LiKe THiS) and otherwise reject conventional English style and grammar.