If you are asking after artistic things that are going on at present, I'm not sure the it will fall under the "Post-Modern" section of some-someday published history text. After all, look at the language that people use in the everyday. Many people refer to where we are as "modern" as in, "modern apartments" and "in modern times." Yes, this is different from the usage in relation to the arts, but it is still linked.

If we take a look at movements in various disciplines of Modern art, by which I mean all disciplines of art and not simply painting or writing or dance, they are typically characterized by a break with tradition. Modernist literature is where we see the departure from form in poetry and the exploration of movement in dance. Similarly, modern art departs from portraits of things, to portraits representing things.

The Post-Modern, as I interpret it loosely, allows for freedom from both traditional, established forms as well as the establishment of reacting against prior forms. This is why we see many forms of art borrowing from other movements combined with new ideas to create something entirely different.

To be flip about it, we have the freedom to choose pornography with or without pubic hair.

I think you're right that it's very much about utilizing "what sticks" for maximal effect. The explosion in exposure in terms of influence is something that has never been seen before and it's very hard to understand exactly what that means, from the inside.

Modern poetry is characterized by doubt. And for me as someone who is working within poetry in the present, I think that post-modern poetry operates under the doubt that anyone is paying attention and thus, "how can I play with the fact that I don't know if anyone is paying attention?" I think that this relates to other forms of art as well. Take our love of Easter Eggs, things referencing other things the creator has implanted within the work, which those savvy to the popular culture and thus the culture of the day, will understand and enjoy, thus enhancing the piece. This is a bit similar and I think it grew out of things like the "musical jokes" found within various pieces of classical music that were popular in their day, or Duchamp's readymades, notably the piece often referred to as L.H.O.O.Q, which uses a reproduction of a postcard of da Vinci's Mona Lisa as well as some clever wordplay.

However, post-modernism seems to focus less on the question, "what is art?" and more on, "where can art go?" or, "what can art become?"