[ekke]

Why not? Because it changes the meaning of '.':

  ~$ echo date > d.sh
  ~$ d.sh
  -bash: d.sh: command not found
  ~$ . d.sh
  06:37:21 EDT 2013
  ~$ alias .='cd ../'
  ~$ . d.sh
  /home$ Is not works!

But another alias with no previous meaning would do well - i use 'up' :)

[dan2k3k4]

I use ".." to go up one, and ".. 3" to go up 3. Source: http://alias.sh/cd-number-dirs

[eroullit]

For "longer" jump through the filesystem, 'autojump' does a great job https://github.com/joelthelion/autojump

[juanbrein]

Great, thank for the advices. I'll take a look at them all!

Cheers

Juan