PhotoJoiner.net allows you to join your photos horizontally, vertically or in a grid. You can make a photo strip or a collage with your photos.
You can select how you want your photos joined and see a real time preview of how they will look. You can rearrange the photos or you can remove certain photos and add more.
When joining the photos in a grid you can choose how many columns and rows you want.
Additionally you can set a margin to be shown between the photos and the color to fill the margin with.
When you are done joining the photos you can either save them on your computer or you cna share them on Facebook or Twitter.