Yo! STM has saved me $$$$'s over the past few months, so I wanted to share this little nugget with you - Millennial Media and Startapp (I can highly recommend both traffic sources) both have promos on at the mo.
Millennial Media will match every dollar you spend upto ($150) in March - so $150 worth of free traffic - see here:
http://blog.hackerincome.com/?p=72