To rip to FLAC. That's about it. Occasionally I'll buy a cd directly through the band (especially if I'm at a show) so they get the money directly. All the cds in my cars are burned, since life in a car is rough on a cd; the original physical copies sit in their jewel cases on a shelf next to my computer desk.
Also, quite often when I'm using music as a background for doing something else (drafting, gaming, etc), I queue up a couple songs from each album and compile them into a rough, very elastic playlist. Just makes more sense to do everything digitally.