Install this script ?

delisub lets you easily subscribe to tags on del.icio.us.

delisub also enhances your subscription page, telling you where each post comes from. You can easily remove a subscription that gives you boring posts, or too many posts.

Try subscribing: upcoming books, joshua's del.icio.us.

Warning

The "via" and "unsubscribe" features haven't been adapted for the new del.icio.us.

Screenshots (vintage)

Subscribing

Unsubscribing