I prefer the Dropbox method for sharing files.. Apart from my iPad, I have two computers and a laptop and an Android phone. All of them have Dropbox installed giving them all full access to the files I want to share between them.
But another way to do it would be to use a VNC app like iTeleport
iTeleport | Home .. That app lets you access your computer directly from the iPad. The computer screen appears on the iPad allowing you operate it remotely so you could open Word or whatever to edit documents, then send them using Outlook or whatever you use as a mail client.