- Madame Kunterbunt - lots of information about sustainable building, Earthships, building with Earth, Straw, and an interesting blog.
- Freecycle - get stuff for free, get rid of stuff and make someone else happy!
- Just for the love of it - Freeconomy: share skills, tools, and give unconditionally!
- Hospitality Club / CouchSurfing / WarmShowers - share your house with strangers (the last one for cyclists).
- Rad Forum - German cycle forum with a huge community of cycle tourers.
- What else I find interesting - can be found on my del.icio.us page.