Search engines don't like subdirectories. The more you divide your website into subdirectories of subdirectories, the more likely the search engines will not pick up the pages. Some of the search engines make it a practice not to go deeper than one or two steps past the root directory. Get in the habit of typing the URL at the bottom of each page. Several search engines check to see the last thing on a page.
Meta tags are important.
Include all the key words and key phrases, but do not repeat them more than twice. You don't need Meta tags at all. In text based search engines it is very important that you do NOT include any keywords or key phrases in either the description meta tag, nor the keyword meta tag. Some search engines do not consider link popularity in deciding whether or not to index a page, but will consider link popularity in determining the relevance of a page. Search engines powered by Inktomi are just the opposite.