I have a few good ones! I wrote the following from Khriss's perspective, and it is supposed to be in the modern mistborn era, so enjoy!
Yttrium
Jumper mistings are notable in their ability to burn yttrium, a toxic rare earth metal. This metal possesses the dramatic ability to punch holes through the physical and cognitive Realms, through which only the Jumper may move.
Corpser ferrings possess a unique ability, I am inclined to believe, in the the entire Cosmere. A Corpser can store their spiritual and cognitive aspects' connection to their physical body. While storing, a Corpser must be extremely careful, the tenuous connection between their aspects and body means that a solid bump on the head can kill them. However, while tapping, almost nothing can kill them. While not granting healing, tapping their yttriummind vastly raises the threshold at which the body separates from its aspects. Nothing short of a meat grinder could kill a Corpser with a large amount of aspects stored up. I believe many more applications of this aspect could be found than simply delaying a death a few extra minutes.
Yttrite
Keeneye mistings who burn this metal are able to view the spiritual aspects of any entity. Notably, keeneyes have remarked that visibility rises dramatically while burning yttrite, though it is stopped by living material.
Bloodbuster ferrings can store in their metalminds blood pressure. While actively storing, a Bloodbuster will experience low blood pressure, and while tapping, high blood pressure. Surgeons and paramedics have found unkeyed yttriteminds to be invaluable, yet I am baffled as to how this ability relates to any of the others granted by yttrite and it's base metal.
It should be noted also, that anyone except a Keeneye and a Jumper are at danger of developing a serious lung disease when exposed to these metals.
Mercury
This metal perhaps should be labeled as a God metal. Simply labeled Pullers, mistings who can burn mercury get a raw form of investiture. The applications appear to be as varied as the Puller's imagination and knowledge of Realmatic theory, but are limited to affecting the Puller's body. It should also be noted that mercury burns exceptionally quick, almost as fast as atium.
Due to the usually fluid state of mercury, it is hard for a feruchemist with the this metallic ability to keep and maintain a usable mercurymind. As such, Comedian ferrings, who store their sense of humor in a mercurymind, have to get creative. Often times, a Comedian will have specialized shoes designed to accommodate the mercurymind.
Liquid Zinc
This metal is an amalgam of zinc and mercury. Mistings who can burn this metal, known as Pushers, have all of the same rules as mercury, except that they can effect everything save alone for their own body. Other people are also more difficult to affect. It should be noted that as soon as the metal stops burning, the effect being induced wears off.
Wondereye ferrings can store in their metalminds their sense of pleasure and wonder. While actively storing, life and sensation become more bland and tasteless, while tapping the metalmind can send them chasing after butterflies, or watching a shoddy movie, giggling in wonder. Wondereyes often use the same methods that Comedians do to keep contact with their metalminds.