From ModMyi - Wiki

Copying your Notes from the iPhone to your Computer

The notes are stored on the iphone in sqlite format, so first grab a sqlite binary from here if you don't already have it on your machine:

Load up your favorite iphoneinterface and grab your notes.db:

cd /private/var/root/Library/Notes/ return
getfile notes.db return

Then to play around with your notes database pass in the filename to sqlite binary, something like this

sqlite3 notes.db

That will drop you into the command line and you can go wild, for docs on sqlite usage see this.

There is also an SQLite GUI Database Browser available for Mac, Win, and Linux Ref: http://sqlitebrowser.sourceforge.net/

Go to this page and download the correct version for your platforum.

Using SCP, or other method, copy the notes.db file to your PC

Open it in SQLite Database Browser.

Edit both the 'Note' table and the 'note_bodies' as you wish, making sure you match each record in the two tables.

SCP the notes.db back to your iPhone.

I used this method to copy the MMS email addresses to my Note Pad for reference.

Warning: Messing with this file could make you loose all notes -- or worse.