yeah
Have you looked in the build folder. Because when you run it in project builder, it sometimes doesn't give the icons you have created. I'm guessing you used the Icon Composer to make the icons right. Restarting the project builder sometimes gets your icon to show up when you do a build of it.
to check you icon though the xcode gui if you don't know how already:
1) Click the vertical targets tab to view the target settings for the project, make the arrow point down next to Targets.
2) in the targets, select your project name.
3) in the Summary at the bottom, select the expert view of the info.plist entries list.
4) CFBundleIconFile, see if the value matches.