I probably wouldn't say that my tastes have changed per se, more like refined.
Authors I like get collected to a degree, books that are "important" find a place on my library and there is a wider range of authors and styles available to me.
I don't dismiss the frivolous - I love my Agatha Christies and read 20 - 30 of them each year. My range of Australian authors is growing. My cookbooks now probably make up 50% of my library.
I also get to read books chosen by a friend who manages to surprise me every time with something new and exciting.
