Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
Debian Wheezy is a great operating system, and XFCE is a great desktop environment- especially for older computers, and for people who prefer a traditional desktop paradigm- but it does have a few quirks. I've just installed it on my old Presario 900 laptop, and I'm going to mention a few things I did after installing to make the computer more usable and nicer looking.
1. Install necessary firmware
Debian doesn't come with non-free firmware installed by default. On booting after installation, I noticed some warnings about firmware not found. Enabling the non-free repository and installing the firmware-linux package and its dependency firmware-linux-nonfree got my graphics card (such as it is) working.