There are other programs that do a similar thing (Look up Collage makers), but there is nothing to beat CA2 for features and ease of use. So you are right, CA2 is more or less unique!
And if you have ever used it, it really is a great way to make news letters/single page leaflets/collages/etc. In fact the program is so intuitive and versatile to use that the amount of things you can produce with it is truly amazing!
PS: I was going to post some examples, but it seems the file size restricts you to a maximum of 2500 kb in total, so one is all you get! And that had to be reduced in quality quite a bit to fit under the restriction.