Two apps make writing on the iPad easy

iA Writer for iPad
http://www.informationarchitects.jp/en/writer-for-ipad/
For less than a dollar, download this text capture app designed especially for iPad. It easily syncs files over Dropbox so you can access your work when you get back to your desktop computer. Writer saves your files in .txt format which can be imported into your regular word processing programs.

Dropbox
https://www.dropbox.com/ipad
Who doesn’t love Dropbox, the easy way to store files in the cloud. Dropbox comes as a free iPad app. It works with iA Writer to make typing on the iPad a practical way to take notes. You can store your iPad photos there, too.