Top 20 (alot of korean sites...) according to alexa.com:
#1
Web Site Yahoo!
Provides intuitive, context-based guides to online content, Web search capabilities, third-party content and community and personalization features which enable Web users to locate and access desired information and services. (Nasdaq: YHOO).
www.yahoo.com
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2. MSN.com
Microsoft's Internet portal. Offers personalized content, with search, news, stocks, email, weather and access to other Microsoft content channels including MSNBC, Carpoint, Expedia (travel) and more.
www.msn.com
3. 다음daum
A very popular South Korean portal. Offers search, news, finance, entertainment, and other portal features.
www.daum.net
4. 네이버
통합 검색과 디렉토리, 웹페이지, 해외사이트, 멀티미디어, 뉴스 검색을 지원하는 검색 포털.
www.naver.com
5. Google
Enables users to search the Web, Usenet, and images. Features include PageRank, caching and translation of results, and an option to find similar pages. The company's focus is developing search technology.
www.google.com
6. Alexa Internet
Please note: The traffic ranking for alexa.com is inflated because users of the Alexa Toolbar are disproportionately likely to visit our site. Alexa provides great search results plus free information about sites.
www.alexa.com
7. Passport.net
www.passport.net
8. Yahoo! JAPAN
掲示板、オークションなどの参加型コンテンツがあるディレクトリ。
www.yahoo.co.jp
9. Sayclub.com
www.sayclub.com
10. Microsoft Corporation
Designs, develops, manufactures, licenses, sells and supports a wide range of software products. (Nasdaq: MSFT).
www.microsoft.com
11. E-Bay
Buy and sell stamps and related items.
www.ebay.com
12. Bugsmusic.co.kr
www.bugsmusic.co.kr
13. Sina北京新浪网
位于北京的新闻中心，包括新闻与评论。
www.sina.com.cn
14. 넷마블
즐거운 게임세상 배틀가로세로 퀴즈마블 워드크래프트 워드워 워드빙고 최강헥사 최강테트리스 파워 알까기(장기) 파워 알까기(바둑) 바 둑 장 기 오 목 따 목 상 목 고스톱 섯 다 세븐포커 슬롯머신
www.netmarble.net
15. Sohu.com Inc.
Produces Chinese language Internet portal and internet communities. (Nasdaq: SOHU).
www.sohu.com
16. Amazon.com
Retails electronics, books, CDs, toys, DVDs, kitchen items, software, tools, games, and much, much more.
www.amazon.com
17. 网易
提供虚拟社区和电邮服务。
www.163.com
18. 드림위즈
꿈이 이루어지는 인터넷 DreamWiz !!
www.dreamwiz.com
19. Gator.com
Gator free eWallet download fills in online forms.
www.gator.com
20. 프리챌
현실사회의 공동체를 사이버에서 더욱 발전시켜 갈 수 있도록 하는 커뮤니티 전문 인터넷 서비스
www.freechal.com