I love the Amazon Wish List, but unfortunately it only tracks things in Amazon (which, of course, is 90% of all manufactured goods in the cosmos, but that still leave another 10%).
Enter Google, which is beta testing an extension to its Froogle service, the Froogle Shopping List. Just sign in (with your e-mail address), and start identifying links to stuff you like on whatever web sites you can find. It serves as a shopping list of things you want to remember but don’t want to buy just yet, but you can also ID certain items as “public” and turn it into a Wish List. Shiny!
Once I get it working, I plan on doing a bit of extended shopping listing.
(via J-Walk)
Some further considerations of weaknesses in the Froogle list here.