Suggested websites to visit to help you prepare for the competition:

1. The World Atlas of Language Structures (WALS) is a large database of structural (phonological, grammatical, lexical) properties of languages gathered from descriptive materials (such as reference grammars) by a team of 55 authors (many of them the leading authorities on the subject).
2. Linguistics Problems from the First International Olympiad (with solutions)
3. Linguistic puzzles online with solutions (from U of Oregon)
4. Samples of international level problems
5. MIT Open Courseware. Introduction to Linguistics class notes
6. North American LO sample problems
7. NACLO 2011 First and Second Round Problems
8. More NACLO Practice Problems
9. Writing systems
10. Language of the world (reliable information)

 

Information about linguistics:

1. The Linguistic Society of America (with answers to questions about majoring in linguistics, jobs in linguistics, etc.)
2. American Dialect Society (fun website)
3. Corpora of contemporary American English, historical American English, and others
4. Speech Accent Archive (wonderful resource of accents of native and non-native speakers of English)

 

Blogs about language:

1. http://languagelog.ldc.upenn.edu/nll/ (posts by professional linguists)
2. http://linguistlessons.blogspot.com/
3. http://www.languagehack.com/
4. http://www.invesp.com/blog-rank/Linguistics (Top 25 linguistics blogs)