Spinitron uses all of these.
Cookies — Spinitron uses a session cookie to identify logged on users. Your browser deletes the cookie when you log off or when you quit the browser. You can delete the cookie but doing so closes your Spinitron session.
Playlist chat also uses a cookie to keep track of individual chat users.
Pop-up windows — Spinitron uses pop-ups for show editing and the calendar. These pop-ups seem to be allowed by browsers' pop-up blockers but if you are having trouble, try disabling pop-up blockers.
Google Analytics — Spinitron uses Google Analytics to get some information on web site usage.