It seems that most people still don't know that Beef is very different than
Poultry and Pork. Poultry and Pork will go bad fairly quick, and should be eaten
as fresh as possible. Beef goes "bad" much differently. Beef is best when it has
been aged, this improves its flavor and makes it more tender too.
Whenever I buy Beef, I plan to cook it 4 or 5 days AFTER the "use by date".
So wait until Tuesday or Wednesday to cook that Brisket. This way it has
a little time to age, and will give you better flavor and tenderness.