Always have the sneaking suspicion you've forgotten something when you're ready to head out the door on a trip? Web-based packing list generator Packwhiz aims to ensure that never happens again.
There's not too much to Packwhiz (in a good way). When you want to put together a new packing checklist, the site prompts you with a few options that create a skeleton checklist with a few packing basics. Actually, "basics" might be a little off—tongue-scraper was on my packing list for a domestic trip to a city/hotel; but you can easily customise auto-generated packing lists to your liking. Packwhiz integrates with your Google account, so you can save your lists for later without signing up for yet another account (assuming you've got a Google account, that is).
If the idea sounds familiar, that's because it's not really new—see, for example, the Universal Packing List or Don't Forget Your Toothbrush. Still, Packwhiz seems to strike the best balance between the Universal Packing List's spartan interface and Don't Forget Your Toothbrush's in-your-face design.