On my iPhone 3G I used Momento app as my journal. It exported text files and I wanted to import them into my diary directory quickly and painlessly, because when it begins to take a certain measure of work, it stays undone in my To Do list for, like, forever. Sometimes I wrote a diary entry on the PC and another on my iPhone on the same date, so I needed both entries to be together.
Also, my diary entries always have the date on the first line.