Switching modes while using Log shipping  from Full to Bulk-Logging and back to Full mode. (4314407)

Paul Randal covered this in a blog post: http://www.sqlskills.com/blogs/paul/post/backup-log-with-no_log-use-abuse-and-undocumented-trace-flags-to-stop-it.aspx

Paul's comment on 10/24/2007 at 3:44:09 PM answers the question specifically:

Hi Graham,

There's no right answer - it all depends (my favorite answer  Using BULK_LOGGED doesn't allow point in time to any time within a transaction log backup containing a bulk-logged transaction, but it does allow large bulk operations to be performed without causing the transaction log to grow inordinately large (although transaction log *backups* will still be roughly the same size as if FULL recovery mode had been used). It all comes down to whether the data recovery service-level agreements your DBAs must support include point in time recovery to *any* point in time.

The big thing to keep in mind (and I only mention it because I've forgotten in from time to time) is

Switch from FULL to BULK
Take T-log backup
Do horrible things that cause outrageous log growth
Switch from BULK to FULL
Take T-Log backups
Profit
http://msdn.microsoft.com/en-us/library/ms190203(v=SQL.100).aspx