For some of us (ok me only) MS Word clipart has gone from cool to lame to “ugh” to groan-inducing to infuriating and back to awesomely retro (kind of like Ray-Ban Wayfarers). Anyway, if you don’t share this appreciation (and a quick survey of friends says you don’t), then you probably often wonder where to get good images for presentations. Presentation Zen lays out a host of good options from the free to the cheap.