Lillies (orientals and Asiatic) will do well....also Hemerocallis.

Lilium speciosum could tolerate a great deal of shade
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L. pardalinum giganteum is also shade tolerant, but would need some moisture to prosper.

I agree that the lily types mentioned will do beautifully. Given your specifications, the only other plant I can think of is Belamcanda chinensis - "Blackberry Lily" - which will tolerate part shade (it's an orange late summer bloomer). It's not so much the partial shade, but rather the dry conditions that are the more limiting factor. I'm assuming also that you're only looking for perennials that are hardy in Zone 5. If tender summer bulbs are not out of the question for you, you'd have more plants to choose from. If you wish, I can give you some suggestions there.

cranebill

Yes, I am looking for hardy bulbs. Those lilies are gorgeous! I have to look into those. I've tried daylilies here and they just dont bloom well. Thanks for the suggestions everyone.

Jen

My Iris do well in partial shade, if you don't mind lifting in the fall Caladiums are gorgeous foliage plants should be available now, I just potted some newly bought ones last week. Although those aren't bulbs (tubers and corms) I thought you might be interested. Janet

Jen, there are several different types of daylilies and thousands of them. Some naturally don't have many blooms but some of them have scads of them. If you do your homework, you can ask on the daylily forum, and you prepare your beds right you shouldn't have a problem with the right ones. Also, there are rebloomers. Good luck with what you choose.

Nancy