Victim said:
This is a bit off topic, but in my game, I ruled that A) characters need to have 1/2 the bonus of the item in ranks, as per boots of elvenkind and B) an item can't more than double your existing skill bonus. A guy with +6 tumble who puts on the belt of acrobatics +30 only gets +6 from the item.
Brilliant idea, mind if I steal it ?

I'll probably change it to double the ranks of the character wearing it (with a maximum bonus of +10 for ordinary items), with no limitations on use.
.Ziggy