Firefox/Chrome/Opera: Interfacelift is one of our favourite sites for high-resolution wallpapers, but the added clicking required to get to the right size is a pain. InterfaceLift Resolutions Links is a userscript that adds direct links to each resolution right on the download page.
You'll need userscripts enabled in your browser or Greasemonkey installed in order for the utility to work. Once added, you won't have to click the drop-down menu at InterfaceLift to select the resolution you want to download-you can right-click any resolution you choose and download the wallpaper immediately.
InterfaceLife Resolutions Links [Userscripts.org]