If you can, TRUNCATE the table rather than DELETE all the rows, as trunc will be much less overhead (btw, in case you're wondering, a trunc can be rolled back in SQL Server, unlike in, say, Oracle).
SQL DBA,SQL Server MVP(07, 08, 09) Prosecutor James Blackburn, in closing argument in the Fatal Vision murders trial:
If in the future, you should cry a tear, cry one for them [the murder victims]. If in the future, you should say a prayer, say one for them. And if in the future, you should light a candle, light one for them.