I try to keep mine pretty basic. I don't like a lot of weight, bulk or jingle.
On the S-Biner I have a small LED light, and my Jeep or Kawasaki key... I only attach one for whichever mode of transportation I am using that day.
Additionally on the cable:
Couple house keys
Gate key
Spare door Jeep key (so I can let it warm up in the winter at work.)
Work fob
P38
swiss tech utili-key
The cable allows it to slim up and I clip it on a belt loop, and it then rides in my pocket. Very little bulk.
I used to have all kinds of extra stuff, fenix E01, ferro rod more paracord etc... I got sick of the bulk and consolidated. I always have most of that stuff in my EDC bag so no use in it hanging off my belt. If for some reason I am going somewhere without my bag or my vehicle I will throw this in my cargo pocket. I consider it my extended extra EDC. Its more geared towards wilderness outings then EDC:
I always have my Leatherman wave with a ferro rod tucked in the sheath, and a Bic lighter tool in my pocket. So even without that extra stuff I have the basics covered.