iPad keyboards - there are a plethora of solutions that are every bit as useful as the real thing because that's what they are!
There is the Apple-brand keyboard dock, which I use to perform quite complex word processing. I produce newsletters and brochures with it on my iPad using Apple's Pages app. This is a great keyboard because it supports iPad-specific keys. The iPad is kept in portrait mode too - which is perfect for word processing.
Then.... most standard Bluetooth keyboards work with it just fine saw well.