(Another) visual thesaurus...

I already knew the commercial VisualThesaurus, but found a free (online)
version names Visuwords - great to visualize relationships between words. Click and hold to move the image within the browswer -

Have a look at one example (from Visuwords):



worth a try - at least for me as non-native speaker (when writing english...)

A free, nice (and complete) book on Linux (in German)

Galileo Computing, a German publisher, made its impressive Linux Handbook
(written by J. Plötner and S. Wendzel) available for download...

more than 1100 pages, covering all Linux distributions. A nice reference, well written.

(its also available in print, with two DVS's, loads of video-tutorial stuff etc.)