DL2BQD is not responsible for the content of the links.
Perhaps some groups could be useful for a search engine later :

p a r t s and data sheets (1)
calculation  (2)
cw (3)
q s o and after  (4)
measuring  (5)
antennas  (6)
kits  (7)
propagation (8)

literature (9)
batteries and power supplies (10)
workbench techniques , see also book: workbench- hints and hints  (11)
PICs (12)

PC and qrp (13)

pse  feel free to  add more  groups

EXAMPLES:

parts diodes
http://www.kpsec.freeuk.com/components/led.htm

parts SMD
http://www.marsport.org.uk/smd/mainframe.htm
http://www.tkb-4u.com/code/smdcode/indexsmdcode.php
http://www.ginko.de/user/franz.hamberger/infobase/charts/smdcode/index.html
http://www.w5usj.com/surfacemount.html

parts  L  you will find the colour codes of L here
 http://www.elektron-bbs.de/elektronik/farbcode/l.htm
parts  colour code and printed codes on L and C and R, more useful stuff
http://www.educypedia.be/electronics/datacomponent.htm
 

parts datasheets
http://www.datasheets.org.uk/
http://www.datasheetcatalog.com/
http://sdw.bgs.nu/
http://www.standardics.nxp.com/

calculation mini cores
http://www.dl5swb.de/html/mini_ringkern-rechner.htm

CW learning the code
http://www.g4fon.net/
CW   learning the code, an adapted  software to be used on line based on G4FON. Great!!
http://lcwo.net/?p=main&p=1

qso mapper  to find calls, locations and distances
http://copaseticflow.blogspot.com/2008/12/new-qsl-mapper.html

measuring wire gauge
http://www.elektron-bbs.de/elektronik/tabellen/draht.htm

antennas Moxon antennas, calculator for dimensions !!
http://www.moxonantennaproject.com/design.htm
antennas material , wire and parts
http://www.dx-wire.de/

antennas    baluns  one of the best known authors
http://eznec.com/Amateur/Articles/Baluns.pdf

antennas  feeder lines, construction hints, tables - a very well done site
http://www.dl2lto.de/sc/HB_HL.htm

kits pixie2
http://www.indianapolis.net/QRPp-I/pixie2.html
kits z-match tuners
http://www.w5usj.com/zmatch.html
kits the paraset
http://www.sm7ucz.se/Paraset_2/Paraset_2_e.htm
kits pfr-3
http://www.qrpkits.com/index.html

kits  from Pixie to Tixie
http://www.al7fs.us/AL7FS2.html

propagation a page from down under
http://www.ips.gov.au/Category/HF%20Systems/Online%20Tools/Prediction%20Tools/URSL/URSL.php?CatID=6&SecID=6&SecName=Online%20Tools&SubSecID=1&SubSecName=Prediction%20Tools&LinkName=URSL

KN4LF's dynamic propagation page
http://www.kn4lf.com/kn4lf59.htm

workbench a bunch of  single ideas  - from island cutter to soldering experience  and a lot more
http://www.qrpme.com/K7QO%20Manhattan%20Techniques%20Paper.pdf

workbench a pdf file  on correct soldering procedure. A lot of illustrations , all in German though
http://www.ersa.de/media/pdf/prospekte_kataloge/loetwerkzeuge/ersa_loetfibel_web_deu.pdf

workbench  a Handyman's Guide...  excellent construction hints, Manhattan style by NA5N
http://www.aoc.nrao.edu/~pharden/hobby/HG-MANHAT1.pdf

workbench  You will find a lot of hints and kinks when you start building, assembling, soldering, de-soldering, identifying parts, Ls, Cs and their code  etc etc here. it's in German but it is a great source.
http://www.qrpproject.de/Media/pdf/DL-QRP-AG-UniDDS_v1_1.pdf

literature, reference books  here you find an electronic compendium in German; it's worth using its search engine
http://www.elektronik-kompendium.de/sites/grd/0201101.htm