The Met has a special exhibition running October 12 - January 23 - great stuff with some of the exhibition online - you should be able to find images, descriptions and in some cases analysis of almost everything you listed - http://www.metmuseum.org/home.asp - Don't limit yourself to the exhibition - there are great photos and information through the whole site - Parts of their permanent Asia collection are here: http://www.metmuseum.org/Works_of_Art/viewHigh.asp?dep=6& ;viewmode=0 Looks like they'll have almost everything that you'll need. The Metropolitan Museum's article descriptions and analysis are also very good.
The vatican collection has photos of great objects (see below) - but you'll need to do more research on those.
The MFA in Boston also has an excellent standing collection:
http://www.mfa.org/artemis/collections/aaoa.htm
The British Museum has a collection of chinese Jade currently on display online:
http://www.thebritishmuseum.ac.uk/compass/ixbin/goto?id=ENC1 1668&tour=sel
The National Gallery of Art has a good collection of porcelain online here:
http://www.nga.gov/collection/gallery/eastcer/eastcer-main1. html
Art history sites can help you with the Analysis once you decide on which items you want to discuss
Tibetan or one Tibeto-Chinese object - In the Met or MFA colleciton
one Shang or Zhou dynasty bronze - Both periods - http://www.marymount.k12.ny.us/marynet/TeacherResources/bron zesproject/html/bklynmuse.htm
one Tang dynasty object - In the Met or MFA colleciton
one Chinese Buddhist object - Vairochana Buddha Vairocana Buddha in the padmasana lotus position and in harmacakra-mudra, the gesture of the "starting-up" of the wheel of the law - Ming Dynasty 1638-1644 - polychrome wood sculpture - cat. 8939 - http://mv.vatican.va/3_EN/pages/x-Schede/METs/METs_Sala01_01 _01_011.html
also Numerous in MFA and Met collections
Chinese Furniture of the 16th and 17th Centuries - MFA
Chinese painting - In the Met or MFA collection
Han dynasty funerary object - Ming ch'i funerary figurine
Han Dynasty 206 BC 220 AD - painted terra cotta - cat. 8959 - http://mv.vatican.va/3_EN/pages/x-Schede/METs/METs_Sala01_01 _02_012.html
also Numerous in MFA and Met collections
Chinese ceramic - In the Met or MFA collection
jade object - In the Met or MFA collection
lacquer object - In the Met or MFA collection
calligraphy - In the Met or MFA colleciton
silk or textiles - In the Met or MFA collection
Neolithic pottery - MFA