You can have multiple $2500/yr contributions from multiple employers
http://www.irs.gov/pub/irs-drop/n-12-40.pdf
See bottom of page 5 through top of page 6:
"However, an employee employed by two or more employers that are not members of the same controlled group may elect up to $2,500 (as indexed for inflation) under each employer’s health FSA. "
However, an employee employed by two or more employers that are not members of the same controlled group may elect up to $2,500 (as indexed for inflation) under each employer’s health FSA.
