Haven't found any from other districts yet.
I've got 4 2006 Atlanta notes that have the little designs filled in, in the District seal. Being circulated finds I don't think they're worth...
Pick up a copy of Bank Note Reporter, it has a monthly price guide.
The 1928 D $2.00 could be a Mule. Check to see if the back plate number is #288 or less. (dcooney: a Mule in this case is a back plate from a...
http://www.webpressnotes.com/websearch.htm Here's a neat web note site.
Separate names with a comma.