Mystery #2 - 4/7/12 - Autumn Olive flowers.

White, funnel-shaped, in clusters. Leaf edges smooth. Young wood looks stippled. Non-native oriental invasive.
see:
https://w3.dstutz.com/~karen/g1/white-ish-wildflowers/aen
also:
http://www.illinoiswildflowers.info/trees/plants/autumn_olive.htm