Here's an interesting blog, a concept, What Did She Text. "As the title suggests - this is a log of some of the text messages she sent."
Since text messages are usually very short, the entries are short. But there's a thread -- and I've only looked at today's, 5-27-2008 -- depending on whether the texting went on.
Today, "she" doesn't seem to be in a great mood. Starting off with this. Then this: "better hurry home so you don't have to deal with me anymore." After that, she's the "butt of the joke." And finally, "Yeah. You couldn't care less."
As of a few minutes ago, there were 35 posts from 2008, in addition to 104 from last year.
That takes discipline and dedication to keep that going. But it would be an interesting record. All such preservation is cool.