My website just disappeared off the lists

Can someone please help me to find out why my website has just disappeared off the search engines. My site has been in the top 10 spots for over 2 years and all of a sudden i cannot even seem to find it pages back. I am wondering for some reason if i have done something wrong or have changed something for the worse. I am not looking to get some secret way of getting to the top or anything just would like to know if i have broken some rule or guideline and being penalized.
Thank You for taking the time to read this.
Rick

I am sorry but that is not what this forum is about. This forum is to answer questions about the submission process of the dmoz.org directory. This forum is not for answering questions about why your site is not listed in the search engines. Please look on the internet for a number of other forums that are way more suited for those types of questions.

Thanks.

See http://resource-zone.com/showflat.php?Cat=&Number=64370