Note: while I try hard not to break links, and so the following will still function, this page is no longer being maintained. See the Craft-by-Craft Contents for the status quo.
Strong overlap with Learning here, but below are some pages that aren’t aimed at teaching beginners.
My free patterns page links to my pattern and tutorial blog posts in all different crafts.
Scrap Users is a compendium of projects that use small amounts of fabric, filterable by project type and methods used.
The final section of Learn Crochet is a gradually-expanding list of crochet materials and techniques, with resources for exploring them.
The sequel page to Learn Hand Embroidery discusses design and creativity, and includes a slowly growing resource list for particular styles and techniques.