There are some terrific sites which have tutorials already published on the web, much better than I would have done, with clear writing and helpful photographs. I am very happy to be able to direct fellow crocheters to these spots.
I think perhaps my favorite site is the Crochet Spot page, which has tutorials on a myriad of topics. Some of the topics that apply to my designs include the invisible single crochet decrease, the magic or adjustable ring, and the foundation single crochet (fsc) stitch. There are so many other topics covered on this site... the only thing that would make it better is to have an index somewhere of everything on it!
PlanetJune is also a great place to go for help on furthering your crochet skills. June has recently re-done her website and made it even easier to find tutorials by making a master list- yay! From the basics to embellishments to special techniques, June has you covered.
Please see also this blog post for more information on starching thread crochet pieces.
What are your favorite resource sites? Or what crochet issue have you NOT been able to find answers for? Perhaps I can help you track down the information you need.