We're testing a classless/point-buy system, with a base cost for most feats, a higher cost for the better feats, and a lower cost for the less powerful feats.
The problem with the feat system currently is there are a great many feats, but not enough interesting ones that anyone ever takes. Per another thread suggestion here a while back, I've started letting people have a bonus feat at every level (only non-combat feats for the bonus ones) and it has not proven overpowering yet (party is around 8th level average).
Having a point-buy system will allow for players to take a good number of the lower-power (and perhaps more role-play oriented) feats for the cost of a few high-power feats. Thus, the jacks-of-all-trade types can really be diverse, and it opens up the door to really sampling all the different feats available.
I don't see having a point-pool for feats as much more complicated than the character creation system available currently. Balancing would be an issue as some others have mentioned, but as of now, there is no balance; people take the better feats and ignore the less powerful ones (generally).