Random Magic Weapons (any level)

A ghost touch weapon deals damage normally against incorporeal creatures, regardless of its bonus. (An incorporeal creature's 50% chance to avoid damage does not apply to ghost touch weapons.) Further, it can be picked up and moved by incorporeal creatures at any time. A manifesting ghost can wield the weapon against corporeal foes. Essentially, a ghost touch weapon counts as either corporeal or incorporeal at any given time, whichever is more beneficial to the wielder.
Aura: Moderate conjuration
Caster Level: 9th
Requirements: Craft Magic Arms and Armor, plane shift
Price: +1 bonus
Source: Dungeon Master's Guide v.3.5