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What type of ways are you talking about tedster?
unless you got a message from Google via webmaster tools that you've been removed I wouldn't ask google to reinclude you
Dear site owner or webmaster of ....
We've detected that some of your site's pages may be using techniques that are outside Google's Webmaster Guidelines.
Specifically, look for possibly artificial or unnatural links pointing to your site that could be intended to manipulate PageRank. Examples of unnatural linking could include buying links to pass PageRank or participating in link schemes.
We encourage you to make changes to your site so that it meets our quality guidelines. Once you've made these changes, please submit your site for reconsideration in Google's search results.
If you find unnatural links to your site that you are unable to control or remove, please provide the details in your reconsideration request.
If you have any questions about how to resolve this issue, please see our Webmaster Help Forum for support.
Google Search Quality Team
And that was on 03/02.
My site only lost it's positions on 03/17, so maybe I wouldn't have been penalized if I got in contact with them on time.
Now I'm going to try get rid of the crappy links (how?) and get in touch with Google for reconsideration.
It's possible for a competitor to build dodgy links to your site and get you penalised?
a couple of members stated that they maliciously changed out their links to point toward competitor sites