- Enhancement bonuses *are* what allow you to bypass DR in 3.0, so Magic Fang and Greater Magic Fang work exceedingly well.
- In 3.5, the changes to DR will stifle the monk somewhat, but he still gets to treat his unarmed attacks as "adamantium" and "lawful" and something else (I forget the third category) eventually. It has been specifically mentioned that there won't be any spells to affect the "type" of an attack, so monks will once more be relegated to carrying a backup weapon, something I find distasteful for certain archetypes of monks, like the "unarmed master who refuses to carry weapons."
- In my opinion, it's a myth that monks do more damage unarmed than with weapons. Unless one travels with a Druid or a Ranger (or a Rogue with good UMD and the right wand/scroll(s)), getting the Fang spells can be a hassle, but an enchanted kama is almost as easy to acquire as an enchanted longsword, just far more rare on a random chart. This means that a +1 Kama will hit more often than an unarmed monk and do the same average damage as 1d8. Likewise, a +2 will do as much average damage as 1d10; a +3 as much as 1d12. Plus, hitting more often further increases the average damage.
For campaigns that allow enchantment of unarmed attacks, this isn't quite as true. (I use the Amulet of Mighty Fists as a template and the weapon bonus charts, so the formula for price is n^2*6,000 gp, where n=the total enhancement. Thus a +1 Flaming Amulet is 24,000 gp.)
Adding elemental damages and other special affects onto a monk's weapon further makes them far more reliable and powerful than attacking unarmed.
Greg