Zeroed drive 4 times - can data be recovered?

Just sold my old g3 clamshell iBook, and I used the disk utility (or something like that) to zero all the data. Because I'm fairly neurotic, I went through that whole process about four times. How easy or hard would it be for the new owner to recover my data if he decides to get snoopy?
Thanks!

Thanks -- luckily, the guy who bought my G3 iBook was an innocent looking kid who just seemed genuinely happy to have the computer -- and I'm guessing that by the time he sells it to someone else, all of his data will have filled up the drive further, so I can't see where anyone would be motivated enough to hire a pro to go treasure hunting on the HD.

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