Slideshows

And if you want to take it up a notch, Animoto creates cool slide shows from your photos automatically. 30 second shows are free, or you can pay $30 for unlimited use a year (and I think they have a plan in the middle). All you do is upload your photos, pick (or upload) you music, and they do the rest. I haven't made enough to see how similar they all come out, but they look kinda cool.

How To: Embed a Picasa Web Album into a Blog Post