These links have been assimilated over the last couple of years since or so since I first started looking into buying a syncro Golf. None of them are verified, but most of them should be useful.
If you've got a decent syncros link then keep sending them in
Syncro only sites
Mechanical & reference
Car specific links
General gti & styling pics
AWD, syncro system & general Golf reference
Shops/suppliers of Golf related stuff