Take a look on Paul Randal's posts:
[A SQL Server DBA myth a day: (12/30) tempdb should always have one data file per processor core][1]
[Comprehensive tempdb blog post series][2]
You will find very useful information here related to tempdb.
[1]: http://www.sqlskills.com/BLOGS/PAUL/post/A-SQL-Server-DBA-myth-a-day-(1230)-tempdb-should-always-have-one-data-file-per-processor-core.aspx
[2]: http://www.sqlskills.com/BLOGS/PAUL/post/Comprehensive-tempdb-blog-post-series.aspx
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