Cherryhill, this is something that comes naturally to stronger players. The idea is to use the (very real) threat of the many White stones to gain somewhere. If you think about your basics, you'll remember that corners are valuable because it takes two walls to make territory, the two joining sides making for natural walls of their own.
What then of a wall facing the outside? At your level you might be confused about some joseki where one player takes a small wall facing out. "This is an even result", most say. The first thought that might come to mind is that you'll need two more walls to make the territory the other player made in the corner. Of course this would be inefficient. The first player would win for sure. 
So it comes down to making more efficient use of that wall. If you want to make territory out of those stones, there are two basic methods. You either:
A) Kill something with it (2 points for every stone killed versus one for regular territory)
B) Threaten to kill something until you get enough 'free moves' to make territory somewhere else
Guo Juan is demonstrating both approaches here. White's wall is perfect (no defects, all stones connected) and huge, and if Black extends to make a base in that area, then if you play something along the sequences TIM82 has posted, there's a very real chance half the Black group will die. Meanwhile, you're going to be making an amazing amount of points on the right. And the White stone at Q10 means you can skip reinforcing the right side for one move, since it's already there.
Some of the confusion might also stem from the last move from White shown in your diagram. The beautiful thing about thickness is that you can play otherwise unreasonable moves to great effect. Take any of TIM82's sequences and play them out on an empty board. The result will be terrible for White every time. Because of the wall and the stones on the right, however, it's Black who, split up like he is, is in serious danger. 
Instead of the kick, the beginner's instinct is to pincer, but in this case the wall is too close and inefficient. Black dives into the corner, gets territory, and White comes out of it with two walls facing each other. They're now unusable and White will have to add at least one more move in that area to keep Black from reducing it.
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invade question.sgf [206 Bytes]
