Mark Anthony Kathurima , Sep 03, 2009; 07:18 a.m.
On an overcast day, you would get the most even lighting. In absence of that, on a bright sunny day, take them to a place with open shade. Try and shoot at a time when the sun isn't directly overhead, so maybe you can use the shadown side f a large building. But then again, depending on your style, you could still shoot in bright sun and overpower/complement it with a variety of techniques - check out http://www.strobist.com for a few pointers.