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Vulnerability Scanner ?
You mean something like sn00per (http://sla.ckers.org/forum/read.php?12,4892,12717) (code)?
What kind of scanner do you want to build? What types of flaws do you want it to find? Should it be fully automated?
Sn00per simply aims to find files/folders indicative or a bad setup. It doesn't check for vulnerable versions of software, it doesn't have a fuzzer modules to scan for XSS, CSRF, RFI or anything else.