[calvinf]

Even if PhotoShop has these capabilities, it's not a tool for the masses. The goal of ScrapWalls seems to be making it easy for anybody to make the collage whereas not everyone has or knows how to use PhotoShop.

[KBorders01]

Good point. Also, doing something similar in PhotoShop would probably take a lot more time.

[goldenjm]

Also, you can't order a printed poster from PhotoShop.