I did this to see how many maps are actually using these items in OA 0.8.8. I'm using as a base the .bsp files as of OA 0.8.8. The items are the powerups (Quad, Battle Suit, Haste, Flight, Invisibility, Regeneration), the holdables (Kamikaze, Invulnerability, Medkit, Teleporter), the runes (Ammo Regen, Scout, Doubler, Guard), and the so-called superweapons (BFG, Nailgun, Chaingun, Prox). Just for the sake of it, I also did Megahealth and Grenade Launcher. Attached is a PDF with the results.
Battle Suit (14)
Flight (3)
Haste (9)
Invisibility (13)
Quad Damage (37)
Regeneration (15)
Invulnerability (5)
Kamikaze (5)
Medkit (5)
Personal Teleporter (6)
Ammo Regen (28)
Doubler (35)
Guard (41)
Scout (32)
Megahealth (58)
BFG (6)
Nailgun (29)
Chaingun (14)
Prox Launcher (12)
Grenade Launcher (77)
Grappling Hook (0)
For the SVN at rev. 951
go here.
For the OACMP maps
go here.