There's one thing you should think about when you create your custom promotional product. If you're in the computer business, you might think twice about handing out magnets. While most magnetic advertisements don't end up in a client's computer room, they could.
Sometimes people forget, but magnets (especially bigger, stronger ones) can mean death to a disk or hard drive. So, save the magnets for the kitchen, and hand out handy desk items like sticky notes, pens, and calendars that will make any computer geek happy.