National Library Building and the Capital Stadium:
The green roofed building with two wings is the national library. The fancy slate looking building next to (the north of) it is the new wing. Of course it has to be the largest in Asia.
The park to the left (west) is the purple bamboo park with the first big lake after the river flows past the summer palace into the city. It takes about an hour and half hiking along the river to the summer palace.
That big green area in the upper part of the picture is not the edge of the city. It is the old summer palace (that was burned down by Brits and French in the late 19th century) that is now Peking University, Tsinghua University and YuanMinYuan Park.
In the center of the picture, the modern Chinese building is the Ministry of Finance of China. It was supposedly built in the early days of the PRC. Of course, one can't ignore the egg shaped building in the upper part of the picture, the national center for the performing arts.
In case you are wondering what is going on in the dried part of the lake, it is the subway line 9 that is supposed to operate in 2012.