To get popular tags for the URLs I bookmark, I've coded the simple bash script below. A delicious.com account is necessary since it uses Delicious' API.

user="username"
passwd="password"
url="$UZBL_URI"
 
curl https://$user:$passwd@api.del.icio.us/v1/posts/suggest?url=$url -s|grep "<\(popular\|recommended\)>"|sed 's/\s*<[a-z\/]*>//g' | dmenu -i -nb "#333333" -nf "#888888" -sb "#285577" -sf "#ffffff"