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lufc1955 - 8:43 pm on Jun 7, 2005 (gmt 0)
Once you are sure your site is ok you can send a reinclusion request from the Google support page. Include as much detail as possible about any problems you have found and what you have done to correct it. You will also have to say that you won't break the rules again (and mean it!) Depending on the problems you have found and how long you were using spam techniques for you are likely to be excluded for a while. However, other possible reasons for being dropped include your server being down when the crawler came around or lack of links, in which case you might find that your site will come back after it has been crawled again or once you get some good incoming links. You need to find our what the problem was before sending a reinclusion request to Google.
Google don't drop a site for no reason, so if I were you I would make sure that your site is completely "clean" with lots of good quality content. Check all the coding. Make sure that your site complies with all the Google guidelines that are shown on their site. You need to make sure that you have some good links to your site as well.