Misc:

wand of petrification - has a chance of changing the material of every item and monster it hits to stone
is - these things are expensive but their amount is every now and then cut to half (mockery of Adom's si :)
ring of conflict
vodka bottle of plenty
knuckles

Weapons:

baseball bat
steam-powered flamethrower
machete

Armor:

cloak of displacement - when the owner is being hit, this occasionally displaces him
reflector shield - reverses the direction of beams
helm of ESP
sandals of Hermes - flying
amulet of improbability - causes odd improbabilities
spiked gauntlets
night vision googles - infravision
mutant armor - acid immunity, spills acid, polymorphs monsters around, permanent lycanthropy + parasitized + leprosy

Other equipment:

amulet of unchanging - stats never change, immunity to polymorph (juts like in Nethack)

Inside jokes:

Blessed Boxer-shorts of Protection from Elpuri
Holy Toesocks
Windows 95 Master CD
