LordCephy: I don't consider darts, throwing daggers, and shurikens ammo. They're not loaded into a weapon that launches them. I agree with wikipedia's definition in that ammo (short for ammunition) "is the material fired, scattered, dropped or detonated from any weapon or weapon system."
From a standpoint of game design, these function like ammo; they can typically be thrown only once, and then they're gone. So, IMO, it makes sense to call them ammo from the perspective of this topic.
LordCephy: If you consider the game Veil of Darkness, not on GOG, there's darts in the game that can be thrown then recovered to be thrown again.
Dongeon Master allows you to retrieve thrown weapons, but that game also lets you recover arrows that you shoot from a bow.
Also, Wizardry 8 has a special gun that can shoot things that are normally thrown, like throwing daggers and darts.
rtcvb32: I'm suddenly reminded of Valkyrie profile. You can make items and they are indestructible and you hand them out, but if you pick up items from the human world they have a 5% chance to break on every hit/use. A unique case where things do and don't break in the same game.
Or SaGa Frontier 2. Typical items (which are called "tools" by the game) will break after a certain number of uses (and the game displays the remaining number of uses quite prominently). There are, however, special unique items called "quells", and they never break. There's also steel, which also never breaks and is non-unique (except a few that are story-related, and generally stuck on whichever character comes with them), but has the drawback of interfering with your magic.
SF2 also has the interesting mechanic where, when a weapon breaks, it changes into chips, which can later be converted to the game's main currency. (Instead of being able to sell items for extra money, you can also convert tools (and only tools, not quells or steel items) into chips at certain points; the number you get is the game.) Also, weapons that reach 0 durability don't break until end of combat, but do only half damage until then.
Incidentally, for whatever reason, in SF2 only some characters can use martial arts. (Other art types are mostly unrestricted; there's one character who can't use magic (and that fact is actual very important from a story perspective), and one character who's restricted to swords and magic because both his weapon slots have unremovable swords.)