I'll make a start...

https://www.multipool.us - Although they don't seem to have FLT listed on their ports.
http://www.middlecoin.com/ - Doesn't show which coin they are currently mining so potentially could be FLT when it's profitable. Auto payout in BTC
http://clevermining.com/ - Same as middlecoin.
https://hashco.ws - Just mines the most profitable coin, can switch after every block.
https://www.ltcrabbit.com/
http://switchercoin.com/
http://themagepool.com/