some useful tips:

1. Site structure
Make sure your sub-pages are easily accessible by search engine bots. Create a site-map page that links to all pages of your website and place a link to it from the homepage. If you have a large website, break the site-map up in several parts and keep the total link number under 100 per page. Link from your homepage to deep pages to get them and the sites around them crawled faster.

2. No session IDs
Get rid of session IDs. Bots rarely index pages with a session IDs because they think that those are different pages (because of the different IDs) with the same content.

3. No variables in the URLs
Avoid variables in the URL. They are indexed slowly and often getting no Page-rank. Use Apache's mod_rewrite feature to convert your dynamic pages to static. Redirect all old pages to the new ones with a 301 redirect. Note however that if you do that for your established website, search engines will need some time to crawl the new static pages.

4. Get links !
Inbound (incoming) links are half of the SEO battle nowadays. Your website needs links from quality, on topic websites. The higher your Page-rank the faster and deeper your website will be crawled by bots. Get links not only to your home page, but also to the deep pages. Make sure the spiders can find your site from different places.

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