Florida Senator Bill Nelson: http://www.billnelson.senate.gov/contact/appropriationsfy09.cfm
Montana Representative Denny Rehberg: http://www.house.gov/rehberg/approps.form.shtml [Page not found]
Ohio Senator Sherrod Brown: http://brown.senate.gov/ohio/constituent_services/spending_request/
Check your own two US Senators' and US Representative's websites to see if they presently offer this same online constituent appropriations "service".
AFP in its post suggests we taxpayers hijack these online forms "to make a statement about just how big a problem earmarks have become (wink wink, nudge, nudge) and to demand transparency for earmark requests before earmarks make it into appropriations reports." I don't know how this may (legally) be done, but we are the owners of this country, and our representatives work for us... it is up to us, ultimately...