Ideas for boosting the soil temp in raised beds

[bigbubbacain]

I never had to consider this before, but my plants are getting tall and leggy and i really need to do something soon. I have 2 raised beds, 6'x26' and I use drip irrigation. I've read old posts about plastic sheeting, newspaper, black mulch fabric, even the 3' rolls of that brown painters paper they sell at that "depot" place. Are any of these really going to contribute to raising my soil temperature?