Excel Spread Sheet
Then I actually have a separate Word document with one page per month that is the outline of songs that I (save as a PDF [I print PDF one page so it's just one page per month for them and not the whole document] and) email to the Primary Presidency and the pianist each month.
Word Document (Jan-Jun)
Maybe that's a lot, but that's what works for me. There are lots of planning and organization tools and ways out there, the trick is fiddling around and figuring out what works best for you! Good luck!