I know, I know... you might be saying to yourself, "I may not use it now, but I need it in my arsenal just in case..."
What stones (or honing methods) do you have, that, for whatever reason, you no longer use. I would say a good measure of time would be 6 months. If you haven't used a stone in 6 months, let's say you no longer use it. Feel free to expand on why you no longer use the hone below.
I ask because it seems that every time someone asks about "What stone is best", someone says "Stone A" and someone else says,"I have a Stone A and no longer use it because my Stone B came in and it blows Stone A out of the water (or oil, or whatever)"
My Chinese Natural hasn't seen much action in about 6 months. It's a great stone.
I have a barber's hone that is attached to my little travel hone/strop setup that hasn't been used in at least 6 months.
I have a Spyderco Ultra Fine that I haven't used in at least 6 months for honing a razor. What a stone! Sharp and S-M-O-O-T-H!
I haven't used my Pasted Balsa Strop (Chromium Oxide and Iron Oxide) in longer than 6 months.
None of them have gone unloved because I have found something better, or quit honing, or something to that effect, I have just been playing with alternative hones for a long time. The CNat will likely remain as my natural finishing stone, and the Spyderco UF will be my synthetic. The pasted strop will be on hand "just in case", and the Hone/Strop will be "in case I want to use it when traveling".
In no particular order:
Spyderco (Ultra Fine or Fine)
Pastes/Sprays (Chromium Oxide, Iron Oxide, Diamond, Boron, Aluminum Oxide, etc.)