Current sourcing octal buffer/line-driver for 7+1 segment LED multiplexing?
In the "for what it's worth" category, this resource I found below lists quite a few latching constant-current LED drivers (8 and 16 bit). 
http://www.altera.com/literature/an/an286.pdf

Some of them actually have shift outputs so you can gang them together and write one long stream to the first device in the daisy chain.