I'm about to make a plugin available for WordPress that lets folks display Picasa images in their posts using simple, custom tags that my plugin parses and converts to xhtml. It can also display album thumbnails, and groups of photo thumbnails (data from your Picasa RSS feeds are saved to local tables, so it's not hammering the RSS). Right now I've set it up so that clicking on an image will take you to the photo (or album) on Picasa.

My question is, do the images have to link to Picasa? Could I, for example, have a thumbnail that's displayed in a post link to a larger version that's shown in a WordPress page? If I did that, visitors to the site wouldn't even be aware the images were coming from Picasa. The terms of service seem both broadly and vaguely worded in this regard, so it's not really clear to me what's permissible - and I'd rather not find out the hard way ;-)

Thanks,