Sparkplug Comic Books will be at two shows this week.The Portland Zine Symposium (July 24-26)and San Diego Comic Con (July 22-26)We'll be premiering three new books:the Shortest Interval - by David KingSausage Hand - by Andrew Smith (published with Teenage Dinosaur)Neptune - by Aron Nels Steinke (published with Tugboat Press)All of them are