I also have one that acts as my media centre, and as well as the media centre client systems, and one for retro gaming (I still love the old 8-bit NES games).
I've gone down the rabbit hole of Amiga emulation:
I've even managed to get an emulated Amiga to play MP3 audio with total fidelity (with the aid of the JIT system in FS-UAE), as detailed in that Markdown. I will most likely eventually go down the rabbit hole of Commodore 64 and ZX Spectrum emulation as well. I was born in 1988 so these things are entirely new and fascinating for me.
On a related note I wrote a ratings scraper for the most single comprehensive abandonware site (My Abandonware) because they don't have detailed sorting functionality:
Included is a static output dump of the two scrapers (the other is for a demoscene website) which is less than two weeks old. I scraped a lot of genres, platforms etc. and it took a long time to get all the ratings so the dump was included for convenience.