SRD wrote:A thin, green ray springs from your pointing finger. You must make a successful ranged touch attack to hit. Any creature struck by the ray takes 2d6 points of damage per caster level (to a maximum of 40d6). Any creature reduced to 0 or fewer hit points by this spell is entirely disintegrated, leaving behind only a trace of fine dust. A disintegrated creature’s equipment is unaffected.
When Disintigrate drops a character to 0 HP or lower, they become a small amount of dust.
Not dead, just some dust.
So, since at 0 HP you enemies are Staggered, in powder form, you can carry around your enemies in an even more convenient form than Flesh to Stone petrified, since you can talk to them via telepathy.
Between -1 and -9 Hp, more options open up. If you can cast a little healing magic, or are willing to trust that they will stablize, you can keep them Unconcious.
If you need your dusty enemies awake, you can heal them. Even spells as powerful as Heal will not fix them, though a Break Enchantment will work.
Basically, all my mages are carrying small brooms and dustpans after 11th level, although Prestitigitation would be an easier way to collect them.