In my daily rss readings I ran across this little nugget of information that hasn't burned me yet, but something good for anyone working with the SharePoint Search API to tuck away for later.
http://blogs.msdn.com/nishand/archive/2008/10/02/fulltextsqlquery-with-querytext-length-gt-4096-throws-argumentoutofrange-exception.aspx
Long story short, make sure that the query text that you pass to the FullTextSqlQuery is less than 4096 characters otherwise your going to run into some errors.
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