When people write annoying e-mails or make inscrutable spreadsheets, we don’t blame Outlook and Excel; we blame the people. But for many of us, PowerPoint is synonymous with the terrible output it often generates. Because we’ve all been bombarded by so many awful PowerPoint-enabled talks, we’ve come to assume that slide software is a fundamentally bad idea — that PowerPoint is a tool mainly for obfuscation and boredom, and that no good can come of it.