Some time ago my colleague showed me a script that allowed to use one of on-line translators from command line. Not only it looked geeky, but it also turned out to be pretty useful- accessing on-line dictionary without switching to Internet browser is not only faster, but also easier. They say, that necessity is the mother of invention- here is my English-Swedish dictionary in action:
online swedish-english dictionary accessed from commandline

Just to give you the idea how to create your own cutie like the one I have:

• find an online dictionary that embeds phrase to be translated in an a http address
• use wget to download appropriate page, and print it on stdout (try -O option)
• parse wget output usinggrep + sed + awk + whatever_you_wish to get the info you need, and display it in a fancy way

I probably should not be posting sources of this script, as it is ugly and uses brute force method. It will probably turn out useless when admin of site I am wget'ting will make some minor changes in it's translation engine. Hopefully it will work for some time :)

In the attached tarball beside the script itself you will also find two links: SVEENG and ENGSVE, each providing different direction of transtaltion. Just put a bash script and these two links together wherever you wish, create an alias to the two links, and you're done.