Understanding Enchantments:

[Selveem]

I've got a lot of people venting about not being able to wear certain armors anymore; while complaints are valid and most likely already being worked on by the builders and staff who already know this list, I thought it might be useful for our player base to know what items are allowed to have what sort of enchants. So, here we go! Enjoy, folks, courtesy of d20srd.org which has more info as to how such items are generated in cost and such.

Though some of these might sound confusing, the affinities were intentionally left ambiguous; the reasoning is because there is a wide range as to the enchantments that can be placed on them. Also note that wondrous items are an exception to this rule. They can have different affects not ruled by this table (but, when they do, they're more expensive to make).

Body Slot.......................................................Affinity
Headband, helmet.....................................................Mental improvement, ranged attacks
Hat..........................................................................Interaction
Phylactery.................................................................Morale, alignment
Eye lenses, goggles...................................................Vision
Cloak, cape, mantle...................................................Transformation, protection
Amulet, brooch, medallion, necklace, periapt, scarab......Protection, discernment
Robe........................................................................Multiple effects
Shirt........................................................................Physical improvement
Vest, vestment.........................................................Class ability improvement
Bracers....................................................................Combat
Bracelets..................................................................Allies
Gloves.....................................................................Quickness
Gauntlets.................................................................Destructive power
Belt.........................................................................Physical improvement
Boots......................................................................Movement

[Brar]

It is a very nice list, however, this table lists body slots affinity, it is only a guideline and not a strict rule. Unless the coders decide to make them so.

And as good as D20SRD.org is, I would still advice anybody interested in fully understanding the rules and how it works to buy the rulebooks, with the 4th edition coming out, you can find them for quite cheap on ebay and are more complete than the unnoficial website.
Still, it is a very nice addition to find easily a rule or a table you are not sure about anymore.

[Selveem]

Outside of that are considered wondrous items, no? I explained that wondrous items do not have to follow this listing.

[Brar]

In Dnd, there is 3 wornable magic item creation Feat:
Forge Ring, Magic arms and armors, Wondrous items

Everything that do not falls under "rings" or "arms and armors" is a wondrous item.

The list here is a guideline given in the DMG about what affinity wondrous items tends to follow, in order to help you create your own magic items. They only say that items not following this guideline could be considered costing 50% more in creation (and thus end-users prices), not that they can't exist, there is loads of standard DMG Magic items that do not follow this guideline. One example is the Amulet of Mighty Fist, nothing to do with protection or discernment..