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We just launched a new site that is starting to be indexed well in Google, but Bing and Yahoo are lagging a bit.  I understand that the search engines are different algorithms and will take different lengths of time to index, rank, etc. What I'm curious about is are there any other tips / advice / things to keep in mind when trying to rank on the different search engines? Thanks!!

We recently launched a new site - on June 4th we submitted our site map to google and almost instantly had all 25,000 URL's crawled (yay!). On June 18th, we made some updates to the title & description tags for the majority of pages on our site and added new content to our home page so we submitted a new sitemap. So far the results have been underwhelming and google has indexed a very low number of the updated pages.  As a result, only a handful of the new titles and descriptions are showing up on the SERP pages. Any ideas as to why this might be?  What are the tricks to having google re-index all of the URLs in a sitemap?

I recently read the Moz guide for  "How To Rank - 25 Step SEO Master Blue Print" and had a question on keyword themes. What is considered a theme? Is there a recommended number of keywords in a theme? For example, if my site is for listing and selling cars, would the following terms fit within the same "car" theme or should the terms be broken out by "cars general" / "car locations" / "car types"? Cars Cars for sale in new york Ford Explorer for sale