I already know what you're going to say: "But I don't have a macro lens!" Keep in mind, this lead shot by Shooting Challenge alum Shayan Rostam was taking with a Olympus FE-370 point and shoot. So no excuses!
Photograph a bug or bugs any way you'd like. (I use the word "bug" to avoid arguments about the spider's role as an insect.)
The most traditional approach is the macro lens (or a point and shoot's macro mode). If you don't own a macro for your DSLR, let me say, you can score a decent one for about $100. There are far worse investments in the electronics world. But you can also use a telephoto lens to keep your distance from the subject.
PopPhoto has some excellent practical tips for you, like shoot early in the morning and be wary of your shadow.
The Flying Kiwi discusses the controversies of flash and depth of field.
Beautiful Bugs dissects macro photography—and specifically its use in bug photography—in a very easy to understand way. It's a good read if you're going macro with this challenge.
The Rules - READ THESE
1. Submissions need to be your own.
2. Photos need to be taken the week of the contest. (No portfolio linking or it spoils the "challenge" part.)
3. Explain, briefly, the equipment, settings, technique and story behind shot.
4. Email submissions to email@example.com, not me.
5. Include 800px wide image (200KB or less) AND a 2560x1600 sized in email. (The 800px image is the one judged, so feel free to crop/alter the larger image for wallpaper-sized dimensions.) DO THIS!! IT MAKES OUR JOB MUCH EASIER!
6. One submission per person.
Send your best photo by Sunday, July 11th at 11PM Eastern to firstname.lastname@example.org with "Bugs" in the subject line. Save your files as JPGs, and use a FirstnameLastnameBugs.jpg (800px) and FirstnameLastnameBugsWallpaper.jpg (2560px) naming conventions. Include your shooting summary (camera, lens, ISO, etc) in the body of the email along with a story of the shot in a few sentences. And don't skip this story part because it's often the most enjoyable part for us all beyond the shot itself!