a. The UC Berkeley article was moderately confusing. From what I gathered, the invisible web is the one you can't get by searching with a normal search engine. It includes results from databases that you need to use their search engines specifically to get to or the pages that are created when you search with a particular query. For example, the pages that are created when you search for an author or title on our Library's site would count as part of the invisible web.
The Wikipedia article it links to was a little bit more helpful, but had more information. I'm still not sure why I would need the deep web. I can use databases on their own, if I find one that'll be helpful. Also, if Google can find me millions of hits, do I really need to find billions in the deep web? It seems like not being able to access the deep web is a problem that's not really a problem for most people.
b. As of today (10/31/12), the Infomine site is unavailable. I'll keep checking.
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