The US Government has shut down, however embassies around the world and USCIS will continue to do business as usual, including processing visa applications.
http://edition.cnn.com/2013/09/30/travel/shutdown-travel-national-parks/index.html?hpt=hp_c2
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- Visa Considerations
This invaluable eGuide covers options available to executives and professionals desiring to work and live in the US and explores common pitfalls and widespread myths about US immigration rules and practice.