In the Spider setting, I am using a concept I refer to OOG as "magical pollution" (the same way George Lucas refers to lightsabers as "laser swords"). Similar to the rules in Unearthed Arcana (3.0), a character can take feats that grant him minor magical boons do to being exposed to magic.
I am thinking of having magic items work the same way. Over time they accrue experience and qualify for, perhaps, some sort of "item enhancement" feat?
Just a thought as of yet.