Firstly there is an article Beginners’ Silk-Ribbon Embroidery provided by Threads magazine which has links to how to do the stitches. Next stop would be Silk-ribbon-embroidery.com which houses articles, links and blog which unfortunately has not been updated since 2003 so I guess its not current. There is also information about the Silk Ribbon Embroidery Mailing List which can be found at firstname.lastname@example.org. If you are looking for projects, tips and tricks and tutorials have a browse around Ribbonsmyth. This site also houses a stich guide and a gallery.
For inspiration and ideas for traditional Victoriana styled silk ribbon embroidery see Helen R. Gibb. For a contemporary designer in this style and the inventor of the ‘Alton Loop’ see Marie Alton and have a look at the samples of silk ribbon embroidery by Martina Weber on chatelaine.net. Finally don’t miss Rissa’s site Pretty Impressive Stuff as there is a section devoted to silk ribbon embroidery with heaps of resources listed there.
Who else has silk ribbon embroidery resources online?