I'm getting meeting requests outside of my working hours. Is it possible to set Outlook 2010 to automatically decline meeting requests that are outside of these hours? Or at least notify the person sending the meeting request?
You can't control it within outlook - if its a problem, create appointments for non-working time and mark them busy or OOF so people won't try to schedule appointments at those times.
If you are on Exchange 2007 or 2010, the admin can set it using Set-MailboxCalendarSettings cmdlet, specifically using ScheduleOnlyDuringWorkingHours
Set-MailboxCalendarSettings -Identity "Conference Room 1" -ScheduleOnlyDuringWorkingHours $true