Either put them in a folder (hold down the app until it 'jiggles' the drag it on top of another app, which will create a folder. Then jiggle and remove the other app out of the folder. You can jiggle and move the folder too, or jiggle to rename the folder) or you can delete the app (jiggle it, and press on the cross). If you want the app after deleting, you can reinstall from the app store (in the Purchased tab).... Although, this will not retain any info that you may need in the app.