Well, it's not the prettiest site in the world, but it certainly is useful. The Universal Packing List will generate a customised packing list for any holiday or vacation trip you choose to undertake. Simply fill in a short form and voila! My imaginary trip to Sanibel and Captiva on 31 September for 2 weeks (I wish!) generated a list of 181 items and a shedload of things to remember before I set off.
Generate your own list at: http://upl.codeq.info/.