Here is a quick chronological checklist of things you will need to do leading up to your friend's wedding. Being the maid of honor is a little easier with a simple guide like this. Feel free to print it out and use it. (Provided courtesy of Bachelorette.com):

Early Stuff:

  • Attend as many prenuptial events as possible.
  • Help address invitations.
    • Wedding invitations
    • Bridal shower invitations
    • Bachelorette party invitations (e-mail is OK here)
  • Help the bride choose the bridesmaids' attire.
  • Purchase and have your dress tailored.
  • Makes sure that all the bridesmaids, the flower girl and ring bearer have been fitted for their attire in time.
  • Organizes bridesmaids' gift to the bride
  • Purchase a wedding gift for the couple as well.

Pre-Parties

  • Co-host the bridal shower.
    • Plan games
    • Organize gifts
    • Keep a log of the gifts given and the person who gave them
  • Most bachelorette parties are hosted by the maid of honor.
  • Help address the place cards
  • Prepares a speech or toast for the reception.

Before and During The Wedding

  • Attend the rehearsal and the rehearsal dinner.
  • Help the bride prepare for the wedding by helping her get dressed.
  • Ensure the bride has something to eat before the ceremony so she does not faint. Makes sure she has no lipstick on her teeth, etc.
  • Make sure the bride adheres to the schedule.
  • Arranges the bride's veil and train for the processional.
  • Takes part in the processional and recessional.
  • Hold the ring which the bride will present to the groom.
  • During the ceremony the maid of honor holds the bride's bouquet.
  • Adjusts the bride's gown before the recessional.
  • Adjusts the bride's gown, hair and veil for photography.

At The Reception

  • If a receiving line is used, the Maid of Honor usually stands in it.
  • Usually give a short speech or toast following the best man's toast.
  • Helps the bride change into going away clothes if this is her plan.
  • Dances with the Best Man.
  • Socializes and has fun.
  • Ensures that the bridal gown and accessories are well cared for after the wedding and until the bride is able to have them attended to.

Reference: Emily Post's Wedding Etiquette