There is no need to use URL re-writing, and in fact, the search Engines recommend that you DO NOT re-write your URL's.

These days, search engines are very efficient in indexing dynamic links.

you should rather be focusing on good content, and the generation and submission of XML Sitemaps.

SITEMAPS XML module is far more useful and beneficial to you, and when used in conjunction with your Search Engine webmaster toolkits, SEO management is much more effective.