Starting in IE6, for the first time ever, you can specify your own image for the browser to use as the cursor! The image will replace the default "arrow" one. Properly done, a custom cursor can bring furthered consistency to your site's design.
Magic Wand cursor is multi-platform compatible. Make the cursor on your page the center of attention for once, with this script. It renders minute glowing particles that revolve the cursor in a 3D, circular trajectory, like in a magic wand. Mesmerizing!
Kissing trail is multi-platform compatible. Spread the love on your site with this kissing trail script. It plants big kisses behind your mouse as it moves, each disappearing only after a noticeable delay. This is a good script to utilize during special occasions, such as Valentines.
Screaming No-Right-Click From Hell is multi-platform compatible. A memorable experience for Internet Explorer users who right-click on your page -- this script opens a popup that flies around the screen, screaming. Worse, you cannot shut the screamer up without following a specific instruction. (Default behavior for non-IE browsers also included.) Very easy to install, the script comes as a download kit with simple instructions, sample code, and sound file included.