A few quick tips for those of you buying trail running shoes.
If you do nothing else, look for a pair of good motion control running shoes. Since you're going to be going over all kinds of terrain, keeping your balance and control is one of your top priorities. This can be especially true for choosing women's trail running shoes, since they are sometimes made softer (too soft) and lose the motion control.
The big thing to watch out for with trail running shoes for mens feet is the sizing. Many men just slap on a pair of tennis shoes and take off, not realizing that they really need to watch their fit in order to get a good neutral trail running shoe.
A trail running buddy can help you out a lot in choosing your trail running shoes, as can a podiatrist, who can tell you more about the mechanics of your feet.
Although these are by no means the end all and be all, these few tips will at least point you in the right direction when it comes to choosing running shoes.