This idea straddles the thin line between “stupid” and “simple”, but for me it’s a WIN.
So here’s the scene - you’re at a networking event and someone asks you “what great projects have you done?” If you’re lucky, you might be able to blurt out something the other person will already know… but it’s more likely they’ll just draw a blank. At this point you’ll probably start explaining your work, but we all know that it’s rare for potential clients to talk nerd and in any case a picture speaks a thousand words…. so…
… you boot up the laptop or iPhone to show them a demo, but by the time you’ve connected to the WiFi/3G they are gone. So why not have a summary of your portfolio on your iPhone? That way you can also impress them with your iPhone fu.
It’s simple. Really really simple. Just take screengrabs of your work, size them to an iPhone-friendly 480×320 (or the other way round if you wish) then shove them in a folder and sync with your phone! Best of all, if they would like a copy it’s an ideal opportunity to cement the introduction via email.
To add an arbitrarily-named folder within the iPhone’s Photos widget, Windows users need only add a sub-directory to “My Pictures” (or wherever you’ve setup the photos folder in iTunes) and then sync the phone. OSX users already know how to do it 
[Edit: I thought I should make it clear to new visitors that i'm a non-designer. I'll explain this next week when I've finished documenting the extreme mental anguish that is the design process for me. The examples in the image above were projects my company(ies) has(have) coded. I designed this site and the company's site though.]
[Edit 2: TinyURL for your sharing pleasure: http://tinyurl.com/iPhonePortfolio]