This is great to see as I've been working on a similar project to try to visualize relationships by looking at the number of texts sent over time.

If anyone would like help generating similar analyses of their texting data, I'd be glad to help as I have some machinery set up to do so!

Here's a prototype site I put together that takes iPhone SMS backups and generates a graph of how many texts you've sent over time:

http://herbsusmann.com/relationships/