My site http://www.nauticality.uk.com has consistently been in the top 30 search placements with Google for the key word nautical gifts, and on occation in the UK search I have bveen top and even had my site listed twice in the top 10. I have been on holiday for 10 days and on my return find my site has disapeared and not even in the top 900. I would be very greateful for any hekp explaining how this could happen.
Regards
Clipper

Sandbox? Google displayed you for a little and then dropped to let others be first (also for a while). Obtain more incoming links with your keyword if you want to rank well in G.

Thanks mtishetsky, but that does not explain why all the others up their with my site are still there and mine had disapeared. I am still listed by Google but a long way down below 900.

$hit happens, man. Maybe your server was down when G came to respider you. Maybe it's penalty for linking to "bad" website. There may be dozens of reasons.

How often does Google come visiting?

It depends on amount of incoming links and their quality, also it depends on content change frequency

It can be a google update. Don't panic - get more and more links and your site will always be at the top.

My site http://www.lizatec.com has also disapeared. Only top of the name is visible, but all linked pages seem to have disapeared. But I do not know when it happened.
The only reasons I can think of are:
- my internet provider has allocated us a new IP address. Maybe this was on a black list?
- we are using google for addwords. Maybe when you are in addwords you are no longer displayed regularly?
- for two days we switched our menu to a javascript menu handler. But we get complaints that some of our users could not see our menu any more, so we switched back to the good old HTML only mode.

the javascript menu will likely be the problem. SE crawlers can't see them either.

<added>

Your site also redirects using a 302 to /lizatec/home/. This can also have serious detrimental effect with Google.
</added>

I did some extra analysis:
- we are listed in dmoz.org, but not in the google directory anymore
- we were removed slowly starting from january. I did not recognize it, because 90% of our traffic is using addwords (we are in most cases on the first position in google.nl.
- I tried to help google with the new google sitemap function, but the beta version of google sitemap does not accept http://www.lizatec.com/sitemap.xml. In Internet Explorer it is visible.