I came across a relatively new service offered by Microsoft. It's called
MyPhone. If you sign up for the free account, they send the application to your phone to install it. You then set up your phone to sync with their servers. At whatever time interval you choose your phone will automatically sync all of your phone's contacts, text messages, pictures, videos, calendar events, and tasks to the online account that you created. From there you can review any of the data. If you chose to upgrade phones, you can add that phone to your account and re-sync the data from online to the new phone. It's very interesting so far, although I do have to mention that the first time I synced, I had well over 4000 text messages saved to my phone, and it failed to sync all of them. When I deleted the unnecessary messages, I was at around 1500 and it synced fine. I also have about 327 contacts, about 22 pictures, about 15 active tasks, and about 40 calendar events. Everything else synced up fine. The service is still in Beta so every once in a while it's down, but I would say that it at least syncs successfully about 6 out of 7 times a week, and if it misses the sync one night, it will get it the next time.
EDIT:
Guess that won't help you get it into a text file. Sorry for the unnecessary post.