Chuck,
I left Beijing for the western environs (Kunming ) in June and am heading to the hills and moors of the green Isle for the grouse opener, Sept 1st.
Beijing
Looks like you have a full schedule.
The air is .....well not clean.
The sheer volume of construction alone- central business district and around the Olympic venue- is a sight to see.
If time permits, a couple of places off the beaten path, not really,

this is Beijing.
Kong Miao - The Confucian Temple - If you are short of time be sure you see Dacheng Hall, Kuiwen Pavilion, is a library and Apricot Altar , the best representatives of the Temple's architecture.
The Wangfujing Street Food Market (Donganmen Night Market ) is definitely worth a stroll day or night is best imo. Food- Quanjude (the original P roast duck) - off peak time only or you will never get in.
Enjoy your time.
T.C.
Kumning