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What I believe caused it was a site map type page hosted as homepage of another domain. It had some 300 links on the page to the main site pages...they were hosted on the same ip and submitted in the same PFI .. oh well. Both got banned. Second was just a disposable domain .. and was disposed off .. but I never thought it could get the main site banned .. as no other search engine does that afaik :).
Under influence of a good old friend (Jack Daniels) I thought I'd try adding keyword subdomains and submitting them to Ink. For a little over a week those subdomain pages were on top of everything. Then they disappeared. Although the sites are in the index, they're buried deeeeeeeeeep in the bowels.