To DiamondAce - click on the lines. The circles cannot touch another circle, so put lines in between them. The blocks fill in when the pattern's outlined. If you have lines that form a 90 degree angle, say the top and the side around one circle, then you can automatically put lines around the rest of the block because there's nowhere left for it to go.
Re: Knightman101 - Just hit "S" (i.e. Sell).
Re: Firath - Know the feeling. However, you can get farther if you change the graphic settings to "medium" instead of "high." There isn't as much difference between those two (unlike the difference between medium and low - ugh). That'll keep the game going longer.