Not Enough Minerals

I've played a good bit more of Starcraft II now and I'm still enjoying it. Of the three races in the game I've still only played with the Terrans so far so I'll not do a full review quite yet. I've played a few more of the story missions as well as some skirmishes verses AI. I've beat the medium level AI without a problem so far, next time I'll give the hard level a go. Here's another screenshot from one of my skirmishes.