Why Blog?

So the interface issues are getting settled and now I'm starting to deal with the whole point of blogging. What got me interested was not an essay on blogging, but an essay on the iMac. Some editorialist said that the iMac should be a continuous record of your life. Your digital hub should be keeping track of the files you access through your days, storing your pictures, music, texts, etc.
My initial thoughts were that blogging would make it easier to keep track of disparate types of web links that I encounter. But now I'm thinking this is really headed towards "internal blogging." I don't want a public blab sheet of all my stupid random thoughts, I want to collect all my work, all the form letters I get about my student loan, my tax records, my bills, all scanned in so I don't have to deal with paper files. I want my phone book and records of my calls and faxes. I don't see anything like this happening without a software hub.
I see some possibilities for a personal blog hub in MacOS X, though. You can use MovableType with MySQL alongside other MySQL databases of personal records. If I could keep an local index database of archived records, scan and store them as they arrive, link Web-based record searches to .pdf files maybe, that would be a really useful thing.