US-Cert has published a year-end list of new software vulnerabilites REPORTED in 2005:


QUOTE
There were 5198 reported vulnerabilities: 812 Windows operating system vulnerabilities; 2328 Unix/Linux operating vulnerabilities; and 2058 Multiple operating system vulnerabilities.



For the complete list see:

http://www.us-cert.gov/cas/bulletins/SB2005.html

Regards,
John

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Edit and Note (1/6/06): this report is not without its critics, especially from the open source community. For a summary of some of the questions the report raised, see the article from ZDUKNet:

http://news.zdnet.co.uk/software/linuxunix...39245889,00.htm