This one was suggested by webhead Rita Zeinstejer.
GifUp is a "gif animation" and "avatar generator" website. What I particularly liked about it is the fact that it creates a nice photo slideshow with pictures taken from your webcam, uploaded from your computer, or searched from any website (a flickr search is already included).
In this example, I used the "Create an animation from Flickr images" option. I typed the word "Brasília" (my hometown), clicked on the pics I actually wanted in my animation, and that's it! My animation was ready with html code and a link to advertise my animation. I probably spent some whole 2 minutes doing everything.