Useful? US visa sites

Following websites are the main sources you get Visa info although the quality of information is not guaranteed. 5 to 6 times out of 10(a few seconds back i changed the scale from 7~8 coz i don't want to exaggerate), you'd be better off by asking anonimous at unofficial websites dealing visa issues.
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US embassy in Korea
(in case you're Korean citizen like me or living in Korea)
(Korean) http://korean.seoul.usembassy.gov/importance_notices.html
(English) http://korea.usembassy.gov/

Korea Embassy in US
http://www.koreaembassyusa.org

Department of States

• National Visa Center
  http://travel.state.gov/visa/immigrants/types/types_1309.html
• J-1 visa waiver recommendation
  https://j1visawaiverrecommendation.state.gov/

US Citizenship and Immigration Service (USCIS)
http://www.uscis.gov/portal/site/uscis