Maps of the Beijing Subway system

Beijing Subway map website (thanks to matthewmayer)
http://www.explorebj.com/subway/

Beijing Subway map from Wikipedia (very nice)

from UrbanRail (thanks to VillageIdiot and LC)
http://www.urbanrail.net/as/beij/beijing-map.gif

Beijing Subway Master Plan Map by 2050 (thanks to BobbyLiu)
http://www.freep.cc/p.aspx?u=v20__p_0802082221306371_0.jpg

BJ subway before 2008: http://www.bjsubway.com/images/dtfz/line_2008_s.gif
BJ subway circa 2015: http://www.bjsubway.com/images/dtfz/line_2015_s.gif
(thanks to Admin)

from Official Website of Beijing Subway
http://www.bjsubway.com/chinese_ver/cczn/dtxlt.asp

Maps of the Beijing Bus system

from Official Website of Beijing Bus (thanks to redtomkidd, justme, toballoyola)
http://www.bjbus.com/busmap/map.jsp (only works in IE)

http://www.668map.com/bjmap/ (only works in IE) (thanks to mh)

Map Websites in Chinese

Website Collection of Many Maps of China (thanks to jamhnxx)
(here is the Beijing page; click for other cities/provinces at the top)
http://www.maptown.cn/China/BeiJing/

http://maps.baidu.com/ (thanks to bobarctor)

http://ditu.google.com/ (thanks to bobarctor)

http://www.51ditu.com

http://www.mapabc.com (thanks to Teriyaki)

http://map.sogou.com

http://www.mapbar.com (thanks to Teriyaki)

http://ditu.koubei.com

Online Maps of Beijing in English/PinYin

Interactive Map on the Beijing 2008 Olympics website (thanks to BobbyLiu and benham)
http://en.beijing2008.cn/emap/index.shtml

Very nice PDF map (thanks to LC)
http://www.mapmatrix.com/asia/02101.pdf#search=pdf%20beijing%20map
JPEG of same picture (thanks to jamnhxx)
http://www.9tour.cn/User/UserPhoto/20061518551115149.jpg

Nice JPEG Map in English/Pinyin showing inside 3rd ring
http://www.blcu.edu.cn/english/images/bjmap.jpg (thanks to Herbie)
http://www.tuuke.com/default/gochinamap_id.asp?id=1860 (thanks to jamhnxx)

Fun/Interesting Online Maps

cool "cartoon" map of Beijing (thanks to, of course, BobbyLiu)
http://beijing.edushi.com/

map of Beijing with 360 degree photo views of all drivable places in the city.... wow (thanks to BobbyLiu)
http://bj.city8.com/

3D map of Beijing within the 2nd ring, looks like SimCity.. (thanks to RenYouWei)
http://www.150160.com/BeiJing/Live/200701/22930.html

FlashMap - very cool... (thanks to LaoZhong)
http://www.flashearth.com/?lat=39.91&lon=116.39&z=12

(if you have any resources to add, just pm me, and you will get the credit,
and if any of my credits are wrong, tell me...)