I agree that October is one of the best months, but it is really just the start of an awesome three-month stretch. Easily 3 of the top 4 holidays for friends and family (July 4 excluded) hit in almost perfectly spaced increments. Halloween. Thanksgiving. Christmas. You just go from one to the next, and it's awesome. Everybody is happier around the office because there's more treats and everybody's got some time off to look forward to.
Leaves are changing, football is in full swing, and the Royals are just the cherry on top. Love this time of year.
On a related topic, January through March sucks ass. No more holidays, dark, cold, and brown.