I have php, mysql, and apache already installed, wouldn't what you are suggesting return a message stateing that they are already installed ?
Would I have to change my current soruces.list to say unstable, then do
apt-get upgrade mysql-server mysql-client libmysqlclient12-dev
apt-get upgrade apache2 apache2-doc
apt-get upgrade libapache2-mod-php4 libapache2-mod-perl2 php4 php4-cli php4-common php4-curl php4-dev php4-domxml php4-gd php4-imap php4-ldap php4-mcal php4-mhash php4-mysql php4-odbc php4-pear php4-xslt curl libwww-perl imagemagick
I tried upgradeing through apt-get before, but all I got was a OS reinstall :S