Well looks like there are not too many vulnerabilities in Vista --- yet

Microsoft Windows Vista contains a complete overview of all Secunia advisories affecting it. You can use this vulnerability report to ensure that you are aware of all vulnerabilities, both patched and unpatched, affecting this product allowing you to take the necessary precautions.
If you have information about a new or an existing vulnerability in Microsoft Windows Vista then you are more than welcome to contact us.
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Vendor Microsoft
Product Link View Here (Link to external site)
Affected By 8 Secunia advisories
Unpatched 25% (2 of 8 Secunia advisories)
Most Critical Unpatched
The most severe unpatched Secunia advisory affecting Microsoft Windows Vista, with all vendor patches applied, is rated Not critical
http://secunia.com/product/13223/