A little helper query I came accross, very useful if you want to find all the tables that contain a specific column:

SELECT c.name AS ColName, t.name AS TableName
FROM sys.columns c
    JOIN sys.tables t ON c.object_id = t.object_id
WHERE c.name LIKE '%ColumnName%'

What it basically does is that it will do a join on sys.columns and sys.tables to get all tables that contains that particular column in your Sql Server instance.