If you want to brush up your Photoshop skills, Photoshop World is the conference for you. This big-time bi-annual blowout is coming up in Las Vegas September 7-9. This is an educational conference, with classes offered by top Photoshop gurus and a huge exhibit hall. The organizers, The National Association of Photoshop Professionals, are offering $100 off conference registration for the next six days only (through midnight on Friday, August 4).