http://www.berlinembroidery.com - Tanja has some beautiful very detailed blackwork kits
http://www.lcdesigns.co.uk - Beautiful Elizabethan inspired charts or kits.
http://www.choicesembroidery.co.uk - Some wonderful quick blackwork kits.
http://www.blackworkarchives.com/index.html - Tons of patterns
Free cs and blackwork - Lots of free blackwork designs
http://www.stitchinspiration.com/ Home of Albemarle, Brandon, and many other beauties!
http://gayannrogers.blogspot.com/2006/08/information-about-my-new-redwork.html Redwork Mystery Sampler info
http://www.mimisattic.com/leon.html Mimi's Attic is the official US distributor for Leon Conrad blackwork designs.
http://www.exceedinglycurious.com/ingalls/ingalls1/ingalls1.html J.F. Ingalls Embroidery Stamping Pattern Catalog
http://www.needlepointers.com/ShowArticles.aspx?NavID=672 Instructions, lessons and free blackwork patterns
http://aeg.atlantia.sca.org/projects/howto/blackwork/index.htm Fill-in patterns for Blackwork
http://crossstitch.about.com/od/blackwork/Free_Blackwork_Patterns.htm A few more free blackwork patterns