Emulating network bandwidth and latency

Network Emulator Toolkit:
http://blog.mrpol.nl/2010/01/14/network-emulator-toolkit/
http://blogs.msdn.com/b/lkruger/archive/2009/06/24/creating-a-stand-alone-network-emulator-using-vs2010-beta-1-release.aspx

Network Shaper:

http://stackoverflow.com/questions/130354/how-do-i-simulate-a-low-bandwidth-high-latency-environment