Backpackademia: How to Pack for Europe - The merits of packing light. An excerpt from "Europe Through the Back Door," Rick Steves' travel skills handbook. - http://www.ricksteves.com/plan/tips/packlight.htm
One Bag - Advice on the art of travelling light, living out of a single carry-on-sized bag. - http://www.onebag.com/
The Universal Packing List - Lists of items thought more or less essential by many travelers. You can customize this list for your own travels. - http://upl.codeq.info
Eagle Creek Traveler's Checklist - Printable checklist of helpful gear and accessories. - http://www.eaglecreek.com/checklist.html
Packing for Your Trip - Suggestions of what to pack for a backpack or budget travel adventure in Europe. Includes printable packing list. - http://members.shaw.ca/guideforeurope/packing.html
Packing List - Generic packing list brought to you by Traveller's Tales. Pre-departure list as well as individual lists for both men and women. - http://www.travellers-tale.com/hints.htm
Travel Kiosk Packing List - List of things to consider taking on a trip, sorted into carry-on, hip pack, and camera case. - http://www.afn.org/~afn11300/packing.html
Step-by-Step PackingLight Method - Instructions on how to pack a 22" carry-on bag for weeks of easy, care-free travel. Includes 4 steps for packing a suit. - http://www.packinglight.com/html/method.html
The Travelite FAQ - Packing tips for carry-on-only trips. Learn how to travel with just one carry-on bag. - http://www.travelite.org/
Tips for Travellers - What to take, what to pack it in, how to get what you take into what you take it in, and packing a bicycle. - http://www.webfoot.com/travel/tips/