how to put the result of a query in the subject line of the email using sp_send_dbmail in SQL 2005?

something like
you have "465" rows in this table

TheMadProfessor2009-09-16T06:58:52Z

If you are merely plugging in the result of a count query, this would be relatively simple - just define a string variable and make its value the result of stringing the returned count with whatever constant text you want:

someString = "You have " + sqlResult + " rows in this table."

where sqlResult is the defined variable for capturing the result from your query. Then just use someString as one of the parms in sp_send_dbmail as usual.