Plug: if want to write crisper, try my game, Worrd Warrior.

It's an online game gets you away from the stuffy platitudes of books and pits you against other writers to see who can get the message across best.

http://worrdwarrior.com

I haven't updated it in a little bit, but I'm preparing an update that will position it for competitions in local schools & companies, kind of like a spelling bee but actually useful.