I’ve just upgraded this server from Dapper Drake LAMP server to Edgy Eft using apt-get dist-upgrade after changing all occurrences for dapper to edgy in /etc/apt/sources.list, and so far everything looks good.
There are some issues with the new release, but nothing that should affect this server – only things that might affect desktop systems.
It does have quite a lot of new features as standard including Firefox 2.0 and you can still download it unlike Fedora Core 6 which was avaiable for download for a massive 4 hours before it was pulled.