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We have a large consumer website with several sections that have navigation of several pages. How would I prevent the pages from getting duplicate content errors and how best would I handle SEO for these? For example we have about 500 events with 20 events showing on each page. What is the best way to prevent all the subsequent navigation pages from getting a duplicate content and duplicate title error?

If I have a website with thousands of products, is it a good idea to create a sitemap for this website for the search engines where you show maybe 250 products on a page so it makes it easy for the search engine to find the part and also puts that part closer to the home page? Seems like google likes pages that are the closest to the home page (less clicks the better)

We have an underscore in a lot of our links. My question is since it is difficult to change existing site architecture, is an underscore really that negative? Here is an example: http://www.winematch.com/profile_368-2005-Artesa-Vineyards--Winery-Merlot-Reserve.html Eventually we want to change this to http://www.winematch.com/wine/2005-Artesa-Vineyards-Winery-Merlot-Reserve.html but it is a big project.