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You should get arrows just underneath the thumbnail preview to be able to flick through all the images on the page you have linked too.

Hope that helps

Try this:

http://www.google.com/ncr

Aran has pretty much hit the nail on the head, the main purpose of a sitemap from a SEO point of view is to submit it to Google Webmaster tools to help Google find all of the pages on your website. Of course sitemaps are also useful from a users point of view and helps people to quickly find a page on your site.

I would defiantly recommend you stick to one sitemap per domain.

Regarding redirects - these should help:

http://www.seomoz.org/blog/cross-domain-canonical-the-new-301-whiteboard-friday

http://www.seomoz.org/blog/301-redirect-or-relcanonical-which-one-should-you-use

I'm a big fan of Smart draw but just recently had a colleague share a chart with me via Google Docs which appeared to work very well for creating a flow chart and mapping out site structure.

PR juice is likely to be leaked through any do-follow links, I would recommend adding rel="nofollow" attribute to the linked images.

If its a Lightbox script you might have to hack the source code a little but should be easy enough to find the code which generates the link.