This is what the developer's say:
ChordPro Buddy is an easy to use and elegant song editor for the Apple Mac OS-X operating system. With it you will easy edit, format, transpose, play and print lyrics, chords and tabs. It is an ideal and elegant tool for guitar players or other musicians. The storage format is the widely used, very simple and easy understandible "ChordPro" text format.
And I think, it is worth the money. If you find songs with chords above on the internet just copy them and import them to ChordPro Buddy. It will automatically transform the chords to brackets whithin the song text. This will give you the benefit to transpose the songs later, if you open them on the iPad.
But how do you transmit them? That's really easy. Just send them to dropbox. You should create a new folder in your dropbox, in which you store all of your songs. You can even create subfolders.
On your iPad you should use the app "Songbook". This app can connect to your dropbox account. Everytime you open it it updates from your Dropbox account, so you're up to date with your songs.
Here's a video tutorial
And here's the product page:
And this is a tutorial for SongBook ChordPro
I will write a post for this iPhone/iPad app later.