We haven't made a gift registry yet. We haven't even thought about it (much). Though we've both been living on our own for a long time, we've both been students much of that time. When we moved in together, we discovered that we had duplicates of lots of things - but that a lot of those things were pretty crappy. And then there are major gaps: dining room table, anyone?
I imagine our registry will be pretty eclectic, aimed at filling in gaps and upgrading (cookware, especially) to things that will last a lifetime. (wow. I don't think I've ever typed or said that phrase before!)
Here are some current contenders, awesome gadgets that I didn't even know existed until recently.

Apparently, a
mandoline makes the slicing of veggies, and therefore food prep, infinitely quicker.

I love, love, love seltzer water, or spark, as the Flower Boy calls it. But I hate, hate, hate the waste generated by oodles of plastic bottles, so I rarely buy it. I mainly drink it overseas, where you can get it in reuseable glass bottles. But if we had a
seltzer water maker, I could drink bubbly to my heart's content.