If you want to get radical about it, you can reconfigure your keyboard to a known-efficient configuration such as the Dvorak layout. As you probably know, the QWERTY layout was specifically designed to be un-ergonomic and inefficient (so as to keep typists from jamming the mechanical keys of early typewriters). Dvorak and other layouts are known to be conducive to rapid typing, but your skills would not be transferable across multiple machines.

So it's really a question, first, of whether you intend to stay with QWERTY. If so, I recommend http://www.keybr.com