It has been quite a long while since I've heard the name "LG Optimus Black," but it seems that Team CyanogenMod hasn't forgotten about this once-powerful handset. The first CM10 nightly for the 4" handset just showed up on Get.CM, and unlike other CM10 devices, has made this jump directly from CM7.
It could oftentimes be unstable and not properly tested, lacking any changelogs, but eventually evolving into alphas, betas, release candidates, and finally stable releases.
It's worth noting that this build is using a Gingerbread radio and won't work with v30 bootloader. Other than that, everything is pretty standard fare. Given that this is the first nightly for the device, you should probably be ready to encounter a few bugs; if you can handle that, then hit the link below and fire away!