I have installed Debian 6, and LAMP stack from squeeze repository (default).

After upgrading Apache 2.2.16 from unstable repository to 2.2.22, thanks to this post - how to upgrade already installed apache2 on debian (lenny)

I'm thinking to upgrade all other software packages that I've previously installd from squeeze repository. Should I upgrade them to the ones from unstable repository? Should I upgrade all of them or just selected ones? Here's the list:

* arno-iptables-firewall    1.9.2.k-4 >> 2.0.1.c-1
* bind9                     1:9.7.3.dfsg-1~squeeze6 >> 1:9.8.1.dfsg.P1-4.2
* php-apc                   3.1.3p1-2 >> 3.1.13-1
* fail2ban                  0.8.4-3+squeeze1 >> 0.8.6-3
* exim4                     4.72-6+squeeze2 >> 4.80-4
* altermime                 0.3.10-4 >> 0.3.10-7
* rrdtool                   1.4.3-1 >> 1.4.7-2
* vsftpd                    2.3.2-3+squeeze2 >> 3.0.0-4

Also I would like to ask how to upgrade 5.3.3 >> 5.3.16, unstable repository has 5.4.x versions only, I don't think I'm ready to move from 5.3 to 5.4 yet.

Actually I'm a newbie in Linux, and after Windows experience I have a paranoidal idea to update software to the latest release.

I'd be glad for any suggestions and recommendations!

Thank you very much!