Um, from the looks of it, the "Natural Spell" feat allows for a druid to cast spells while in animal form. From reading the web enhancement, my guess is that the natural spell feat translates the verbal and somatic components of a spell into the equivalent verbal and somatic equivalents of the druid's wildshaped form (Ergo, a silence spell would still screw the druid over). However, unless you have a wildclasp (new item, apparently it looks like it is an item that you attack other items to and thus you don't absorb said item into your body)), you need to drop your components.
With Eschew materials (from T&B), you no longer need to worry about needing components.
Thus, this is a very useful combination of feats. Imagine your druid turning into a dire wolf that can cast spells.