The forumThe Cutting Edge Sandcarving Forum offers a lot of information about sand blasting and the equipment. You can search the archives to see the recommended compressors, blasting cabinets, information about building your own cabinet, etc.
http://www.cuttingedgesandcarving.com/forums/index.phpThe Yahoo Sandcarving Forum
http://groups.yahoo.com/group/sandcarving/EtchworldEtchworld offers information about etching and contains a full selection of stencils on CD’s
http://www.etchworld.com/EngravingThis site contains information and quality tools for glass and metal engraving.
http://airgraver.com/CarvingThis site offers a tool to carve glass and has been used to carve eggs as well.
http://www.turbocarver.com/Resists, Cabinets, VideoThey offer many types of resists for various types of blasting and carving. They offer cabinets and other supplies as well. Be sure to check out the product demonstration videos.
http://photobrasive.com/index.php