When installing Debian "Testing" on the AcerAspireOne the touchpad does not register a single tap of the pad as a left mouse click. To rectify this add the following line to the file /etc/modprobe.d/psmouse.conf
options psmouse proto=imps
According to this Ubuntu source, some setups may be better with exps instead of imps.
To have apt-get/aptitude auto-clean all the downloaded .deb files after running an "update" (to keep as much free space as possible) simply add the following to /etc/apt/apt.conf.d/00autoclean