Nightfall said:
Olive, while I side with you on intelligent magic items on granting feats, (they should), I think Tele has a point about using Force of Will. For two reasons: one, you can use spells more effectively in determining item costs and thus market prices. Two, it's a good spell.
If one has the Arms & Equipment Guide, there's pricing for some feats in the revamped (yet still 3.0) Intelligent Item table section. From what I've seen, A 1st-tier feat (those that don't require another feat as a prerequisite) for an intelligent item generally costs 10,000 gp. In addition, the low-level rogue class ability, evasion, is listed as costing 25,000 gp. The simplest thing to do is to do it this way:
1st-tier feat(lesser power, must not require another feat as a prereq):10,000 gp
2nd-tier feat(greater power) or 1st tier class ability(lesser): 25,000 gp
3rd-tier feat (greater/special purpose only) or 2nd tier class ability (special purpose power only): 50,000 gp.
(I may well end up expanding the idea in some other place if I get the chance.

)
Of course, one should have a good rational for including them. Perhaps a soul is trapped in the item, or it was favored by a certain person, or some of their essence 'rubbed off' on the item in some fashion. The real problem for the 3.5 Intelligent Item table is that it just needs to be bigger, but of course the DMG was already packed to the rafters. Still, an expanded table would've made for a great web enhancement...