Most of the gardens here have hummers in mind...and we do get a lot of traffic. I can't say that I've noticed exactly which plants they use all season long, but basically anything that has a tubular flower is a good prospect.
I might add as possibilities:
Spanish Bluebells
Scilla
A varied supply of hosta
Agastache
A varied supply of nicotiana (annual here) ***
Montbretia
Monarda!
(especially the red varieties)
