recently i developed a new directory for myself and now i m working on its sitemap, my question is that what should i do so that my site map automaticlly updates and inclueds the new pages by itself, wht steps should i follow
You should develop/install such script in your site that generates sitemap whenever you add/remove contents to your site. Kailash
If you choose wordpress as you content managment system then just download google xml sitemaps plugin
I found this resource and used it for one of my websites: coyol.net/30-09-2008/create-google-sitemap-with-php-and-mysql.html
You can create a script and cron that updates your Sitemap file, and then ping Google that you updated it. More info on Google Sitemap and ping URL here: htt_p://www.google.com/support/webmasters/bin/answer.py?hl=en&answer=34609