It may not SEEM invisible, but you may want to consider storing your texts in a revision control system. I use subversion; it stays out of the way.

The downside: you have to remember to commit changes every once in a while.

The upside: you don’t have to create byzantine archival schemes of your own; you can delete files and clear them out of your “mind” without worrying about losing anything, and of course you have a clear history. This can be frickin’ awesome. Plus if you want to create shared repositories with people for projects (hello, GROUP MIND!) this would make doing that pretty easy.

I find it strange that you don’t use folder structure. But your prefix notation probably works best for that Quicksilver workflow of insta-appending… I work with text files entirely within a shell window so that they’re equally accessible from home and work. I’m not sure how to get that QS “quick-append” kind of flow with vim in a screen session, but I’ll have to think on that!