Ubuntu makes alot of seemingly simple tasks very transparent to the user. So all you have to worry about is, perhaps, the speed of their/your internet connection when pulling down updates. ;)
With Debian, you are given a bare bones operating system that's sole job is to boot successfully, and you must build it up yourself to be what you want it to be. Although you are given about a dozen options at installation time as to what you want installed for you before the first boot: ie: Desktop Environment Mail Server File Server DNS Server DHCP Server etc...
As you can probably see from what I can remember, it is very server orientated. But, then again, so is all of Linux.
But, back to the point, if you want the nice subtle things that Ubuntu gives you, you are required to setup all the work yourself, such as nvidia drivers, xorg.conf files, etc... But that does not mean that it is certainly any harder to setup. Thanks to Ubuntu, there are more than an abundance of HowTOs that will work just as well in Debian. Here is a how to automatically compile manually installed NVIDIA drivers after kernel updates, as written by a friend.
I have also mentioned stable... to which Debian is one of the most stable operating systems I have ever used. With the exception of the first time I used manually installed nvidia drivers, but it was an elementary mistake, and you learn to evade it. (see link above) :)
But, where stability is a high priority, you may find that some of the more exotic applications are not available through the standard repositories, and you'll have to search and find external repositories to suit your needs. Such include: http://debian-multimedia.org/
I also found Debian to be a very good developing platform, and using it certainly helped me understand software better, and gave a deeper understanding to how an operating system works internally (though, it is not solely down to just using Debian, but other OS's such as Gentoo, Archlinux, and FreeBSD also).
But, in my full honest opinion, if you are looking for something that uses the best between stability and freely available software, I would recommend Ubuntu Hardy 8.04.1 ... It, to me, is the most beautifully thought out modern operating system of today, but you can still backport things from intrepid, if you wish to have the newest software available. Here is my complete list of external sources for Hardy in a Nutshell:
## Kiwilinux (Ubuntu 8.04 - Hardy Heron compatible)
deb http://kiwilinux.org/archive hardy main
deb-src http://kiwilinux.org/archive hardy main
## Lightweight X Desktop Environment
deb http://ppa.launchpad.net/lxde/ubuntu hardy main
deb-src http://ppa.launchpad.net/lxde/ubuntu hardy main
## Medibuntu - Ubuntu 8.04 "Hardy Heron"
deb http://packages.medibuntu.org/ hardy free non-free
deb-src http://packages.medibuntu.org/ hardy free non-free
## WineHQ - Ubuntu 8.04 "Hardy Heron"
deb http://wine.budgetdedicated.com/apt hardy main
deb-src http://wine.budgetdedicated.com/apt hardy main
## Opera
deb http://deb.opera.com/opera/ lenny non-free
## PlayOnLinux
deb http://deb.mulx.net/ hardy main
## Google
deb http://dl.google.com/linux/deb/ stable non-free
deb http://ppa.launchpad.net/googlegadgets/ubuntu hardy main
## Nautilus DropBox
deb http://www.getdropbox.com/static/ubuntu hardy main
## XBMC
deb http://ppa.launchpad.net/team-xbmc/ubuntu hardy main
## Galaxium
deb http://ppa.launchpad.net/galaxium/ubuntu hardy main
## VLC and other new Audio Libs
deb http://ppa.launchpad.net/c-korn/ubuntu hardy main
## Ubuntu-Tweak
deb http://ppa.launchpad.net/tualatrix/ubuntu hardy main
deb-src http://ppa.launchpad.net/tualatrix/ubuntu hardy main
## Open-Office 3.0 for Hardy
deb http://ppa.launchpad.net/openoffice-pkgs/ubuntu hardy main
deb-src http://ppa.launchpad.net/openoffice-pkgs/ubuntu hardy main
## General Assortment / Other
deb http://ppa.launchpad.net/misery/ubuntu hardy main
deb-src http://ppa.launchpad.net/misery/ubuntu hardy main
## VirtualBox
deb http://download.virtualbox.org/virtualbox/debian hardy non-free
But, if you wish to give Debian a go. Check out the bottom link in my Sig. The Linux Professional Institute Manuals, they give a very good walkthrough of how Linux works internally, and, to me, have been a very valuable source of information for passing the LPI1 exams, and working towards LPI2 Certification.
Regards Iain