I use bcc and read receipts, depending on what I'm sending. Certainly wouldn't request a read receipt for every email I send, I get enough junk mail!
One cunning thing I like about Outlook is that you can display a column that holds a yes/no to let you know if a read receipt has been requested. I then only open an email with the yes flag when I want that person to know that I've read their email! Unfortunately, where I'm working at the moment is a Notes environment and I haven't figured out an equivalent yet.