The networks officially announce their fall schedules in May, but there are always announcements before the announcements. Yesterday, NBC renewed all three shows bearing the ''Law & Order'' name. Today it added ''Medium,'' ''Crossing Jordan'' and ''Las Vegas'' to the pickup list.
Although I like ''Medium,'' the other two renewals won't have any impact on my viewing habits (although I do watch ''Las Vegas'' occasionally, usually with brain completely turned off). I was far happier awhile back when NBC renewed ''The Office,'' a show that was both funny and squirm-inducing in Thursday's telecast.