If you want to get really fancy with your Site Info Bookmarks Toolbar Folder, you can add favicons to each link. I happen to think this not only improves the visual appeal of the list, it's also a mnemonic aid making it that much easier to pick out the one you're after.
To get started you'll first need to install the Favicon PickerFirefoxextension (for Firefox versions prior to 1.5, go here). Since you'll need to have local copies of the icons in order to install them, you'll want a quick way to grab them from each site. I used my Fetch Favicon script to extract them from each URL (you should notice this tool is now on the list of Site Info links, more on that in a sec). Once you fetch the icon, simply drag it out of the browser window and drop it onto your desktop.
In some cases the sites either had no icon, or I had a better one to work with. For more help on creating icons, visit Favicon Tools. If there is enough interest, I may provide a zip file with all the icons in it, or add them to the permanent (and growing) list of Site Info Bookmarks. I'm also investigating a way to save a backup of the Site Info folder, icons and all, and providing the archive to my visitors so they can simply install the whole shebang locally without having to go through all of this trouble.
Until then, the easiest way to add favicons to the list is to save the images temporarily to your desktop and then open the Site Info folder and right click on each corresponding link. From the context menu select "Properties" and after the dialog box opens you should notice a new control group labeled "Icon." Press the "Browse..." button to locate the icon file on your desktop, then click on it to select the icon and return to the Properties dialog. Once you're satisfied you have the right one, click the "OK" button to save. When you're done with all of them, you should have a fancy new list similar to the one on the right.
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If you want to get really fancy with your