I had two last minute projects. One was my bouquet (perfectly imperfect, photos to come once the pro shots are done). The other was a video slideshow that played in the library during cocktail hour. It will also play using a projector at our hometown reception.
I used Windows Movie Maker to create it, and it probably took me 2 hours total to do. Everything is drag and drop and really intuitive. Just create a new project, import your photos, drag them down to the timeline, add music if you would like, and then choose "Publish to this computer".
I drove to Seattle with my mom on Wednesday before the wedding and that is when I imported all of the photos. After they were all arranged, I hit export on Friday night before the wedding and loaded it to the desktop. I didn't put any sound on because we would have sound coming over the master sound system. Also I was out of time :) It's not particularly fancy or beautiful, but it certainly tells the story of us.
The quality isn't as great as I would like it to be, but it works. It starts with photos from our time dating, moves to our engagement/proposal shots, and ends with photos from Poland, and then loops through all of that one more time to make the video 50 minutes. I don't expect anyone to watch to the whole thing! If you would like to scroll to see the shots from Poland, move to 21:30 in the timeline.