All Major Search Engines into Latent Symatic Indexing(LSI) Technique. I feel its a very great improvement in getting natural search results for user queries. Do any one find any disadvantages in it?

Yes you can use both.

Search Engines do crawl and index, hidden and none texts. but it doesn't show up longer time, as search engines become wiser enough they would penalize you are even ban you from their SERP's

5-7% would be optimal.

Google undergoing any updates Could be the reason.

Better target 2 keywords per page and target the same keywords in meta tag as well. Keyword prominence and proximity is importance, and your meta title and descriptions need to with keywords at the...

Read the basic, try implementing. Read more, Keep yourself with the industry updates.

Check http://www.seomoz.org/article/beginners-guide-to-search-engine-optimization

Than counting on daily unique visitors, better work on ROI (Visitors turning into customers)

Hi,

Directories do hold values, as long as they pass linkjuice to the websites submitted. My personal opinion would be, getting links from High PR niche websites woulbe be more valuable from...

Using Div tags will reasonably reduce the codes and will help us to present the content (Which all SE's love) in the top to the search engines. So just becoz u use Div, u wont be getting poor results...