OK, this really isn't about technical advances, but about an odd cultural thing.
One SL tradition is the "Poppins Challenge". On your rez day (the SL analog of birthday), or some other day if you wish, you take a Mary Poppins style umbrella (which is freely available), go to the top of a building or mountain or just way up in the middle of the air (and now I have this urge to go listen to Terrapin Station...), and then descend. Take pictures or shoot video as desired, and emerge from the experience changed.
I finally did it on my fifth rez day about a month ago, and here's one of the pictures I took. I hope you like it.