[CentOS] Many missing updates for CentOS 4?

According to centos-announce there's been no updates for CentOS 4 
i386/x86_64 since the seamonkey errata (CESA-2009:0325) on 2009-03-06.

A quick rundown shows a rather worrying backlog of missing security 
updates, some more than a month old:

2009:0313 - Moderate: wireshark
2009:0333 - Moderate: libpng/libpng10
2009:0331 - Important: kernel
2009:0344 - Moderate: libsoup
2009:0354 - Moderate: evolution-data-server
2009:0355 - Moderate: evolution and evolution-data-server
2009:0341 - Moderate: curl
2009:0345 - Moderate: ghostscript (superceded by 2009:0420)
2009:0258 - Moderate: thunderbird
2009:0362 - Moderate: NetworkManager
2009:0373 - Moderate: systemtap
2009:0397 - Critical: firefox
2009:0398 - Critical: seamonkey
2009:0337 - Moderate: php
2009:0409 - Important: krb5
2009:0411 - Moderate: device-mapper-multipath
2009:0420 - Moderate: ghostscript

Is there any work being done on these?

-tgc