Thanks for that link L4H. I think they may well be snow buntings. If so, they are a ways away from home.
Hazel - they are about half again the size of a chickadee. Very neat to watch. The white on them is almost blinding. Very pretty.
I noticed on the drive downtown this morning that there is another flock about a country block away too. It is also quite large.
Thanks for the help ladies.