As requested by PMJP in my welcome thread, I had some ideas to share for the MAME/WIN emulators section. MAME is my main focus in emulation. I'm still new here and I don't know what the go is with things like the possible need to seek permission for distributing files originating from other sites and whatnot. Therefore, I won't post any links for now unless requested by someone in charge.
OK, so I see that the MAMEUI section could be greatly expanded upon with the help of the MAME32 & MAMEUI32 Museum at progetto-SNAPS. They host MAME32 and MAMEUI32 versions going all the way back to MAME32 0.026a 05-08-1997 and it looks like they have every incarnation of MAMEUI64 as well (currently 0.126 - 0.148).
I also know of a significant MAMEPlus! archive at Replay Burners MAME Plus! Version Page. They have a heap of MAMEPlus! versions from 0.60 - 0.133. Of course, more recent MAMEPlus! releases are available at sourceforge.
It might also be fun to have at least one version of MAME32 Plus! Plus! with Kaillera to help encourage more good people to play many great arcade games with each other online. My version of choice is 0.119.