We're wanting to have a photo gallery on our site, but are unsure which image gallery option (i.e. 4images, Coppermine, Gallery, Piwigo, Pixelpost, ZenPhoto) to use. Is there a site that can explain in layman/newbie terms what the differences are between them? Or can anyone share their experience with getting them up and running?

Right now we're leaning towards Zen, but are a bit wary that it may be limiting down the road.

We're comfortable with HTML, and are learning CSS and likely Javascript, if that's a factor.

Thanks!