Tree ID help please

This tree is flowering in my small woods plot. Any idea what it is?

Here's another picture of it. There are a couple of arrow wood viburnums growing close by

another angle

here is the trunk

It might be a nannyberry, Viburnum lentago

http://plants.usda.gov/java/profile?symbol=VILE

http://www.bernheim.org/viburnum_lentago.htm

Thanks Clay. The description on the websites you provided look close to my tree. I was kind of hoping for 9 bark, but I'll happily take nannyberry.