Command

:ds[earch] -tags tag, ...

:delicious[search] -tags tag, ...

search bookmark contains all tags

:ds[earch] -query term

:delicious[search] -query term

search bookmark contains term in the titile or the URL or the note

Completion

:open or :tabopen command completion

set complete+=D

or write in RC file

autocmd VimperatorEnter ".*" :set complete+=D

guioptions

show Delicious Toolbar or not

set go+=D
or
set go-=D