Here I will try to add a list of links I think are interesting (It will become longer, I just wrote down what i knew for the moment)
Soapbox racing / Zeepkisten / Caisse a savon
www.sejkora.cz European championship at Bozkov (July 2008)
Engineering
www.mathweb.org (theoretical info)
www.springeronline.com (technical books)
www.twaron.com (aramid fibres)
www.maedler.de (everything about transmissions and stuff)
www.metalwork.it (pneumatic units)
www.farnellinone.nl (everyting about electronics)
www.wolfram.com (computer researches)
www.skf.com (THE bearing site)
www.msefi.com (about the opensource computer management)
Collegues
www.dutracing.nl ( http://www.formulastudent.com )
The faculty of aerospace engineering