You are running Debian stable, because you prefer the Debian stable tree. It runs great, there is just one problem: the software is a little bit outdated compared to other distributions. This is where backports come in.

$ aptitude -t squeeze-backports install iceweasel

The -t option here specifies squeeze-backports as the target release. This would install Iceweasel 3.5 from Backports instead of version 3.0 from the Debian stable release.

1. wireless

   $ aptitude install firmware-iwlwifi

2. trackpoint¹⁾

   #Install the xinput package and run the following commands:
   $ xinput set-int-prop "TPPS/2 IBM TrackPoint" "Evdev Wheel Emulation" 8 1
   $ xinput set-int-prop "TPPS/2 IBM TrackPoint" "Evdev Wheel Emulation Button" 8 2
   $ xinput set-int-prop "TPPS/2 IBM TrackPoint" "Evdev Wheel Emulation Axes" 8 6 7 4 5

3. virtualbox: 需要打开 bios 中 CPU 的两个虚拟化配置 to use 64-bit virtual box
4. 待机: 需要安装 pm-utils - utilities and scripts for power management