"Solutions for Common T-SQL Problems" Wiki

MSDN Code Gallery - Solutions for Common T-SQL Problems

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How To Examples of selected T-SQL programming constructs
Create a Comma Delimited List from a Column in a Table
Create and Use A Numbers Table
Control Return Results by Range
Find and/or Delete Duplicate Rows in a Table
Find Rows of Data Between Two Dates
Increment an AlphaNumeric Value
Use ISNULL() and COALESCE()

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Still in the early, initial phase, but could grow into a useful resource (actually it already is for me as I always forget  COALESCE  ;)

(via SQL Server Code,Tips and Tricks, Performance Tuning - Solutions for Common T-SQL Problems Wiki Launched)