They love my butterfly bushes, which may be marginal for overwintering in your zone. They also loved my japanese quince, but I wouldn't suggest planting one unless you can mow around it for at least 15 feet because they spread by suckering.

Lots, but your zone may limit what you can plant. To the list in the attached link, I'd add:
escallonia
Mexican orange
Arbutus unedo
Cape fuchsia
hardy fuchsia
mahonia
witch hazel
winter hazel
spiraea
Itea virginica
deutzia
sweet box
elderberry
flowering currant

Note that some of these are winter bloomers so suitable only for overwintering species.

Here is a link that might be useful: shrubs for hummingbirds

Thanks for the link gardengal48 I will definatly consider these shrubs. I didn't even know they liked Arbutus:)

Butterfly bushes do great in zone 5B. I am in Northern Michigan and had one Butterfly bush in the ground and one in a pot, both outside and we had over 4 feet of snow last winter. They are both doing well.