were there any stamps made with crispus attucks on them?

Answer 1

There was a Crispus Attucks coin put out by the US Mint:
http://www.usmint.gov/mint_programs/commemoratives/index.cfm?flash=yes&action=WarPatriots

As far as I can tell, no postage stamp. If you would like to write the people who make that decision:
http://www.usps.com/communications/organization/csac.htm

Citizens' Stamp Advisory Committee
c/o Stamp Development
U.S. Postal Service
1735 North Lynn St., Suite 5013
Arlington, VA 22209-6432.