What should I look for in choosing wheels for a road bike? I have a commuting/touring bike and my riding is a good bit of commuting mixed with weekend rides of up to 50 miles.

In my lame knowledge, I'll assume that lighter wheels can be had when you spend more money, but what are other things to look for or avoid when choosing wheels for a non-racing bike?
If you're doing mostly commuting I'd look for strength above light. Go for something with more spokes and with a 3 cross lacing pattern. You want something that is reliable. Of course you weight is a consideration so there is always a trade off between that and durability.

Going with something with radial (straight) lacing up front can save weight and you're less likely to break a spoke on the front wheel so there is less chance that durability will be a factor.