Yeah, I have some emoji domains, though the support is weird. Safari actually supports them best.

I keep finding weird places that support emojis, like usernames on some web sites. And someone on HN showed me recently that you can make emoji filenames in Windows at least.

Yeah that was pretty cool, although I guess you run the risk of some browsers presenting it unrendered. If I had a majority of mobile users for a site, I probably wouldn't think twice before using an emoji in my url -- definitely makes it memorable