The ubiquitous ULN2003 low side driver often referred to for increasing current drive for digital outputs has a newer counterpart:
TI's TPL7407L, now with 600mA drive capability. Bummer that it only looks like it is in surface mount packaging 
http://www.ti.com/lit/ds/symlink/tpl7407l.pdf
I wonder where the '7407' refrence came from 
Posted here for future reference.
-AK2DM