Most of the plants I lust after are full-sun. Which would be fine if even a (non-veggie garden) corner of my yard had something even *close* to 6 hours of sun per day. But, I don't.
Instead, I'm constantly on the search of part-sun/shade plants that look cool. It's even better if they *sorta* look like sun plants I love. It's hard, though. Many site, you're lucky if you can sort by zone and *maybe* sun tolerance. Then you're left to your own to wade through the shrubs, annuals, perennials, and biennials yourself. The sites that do allow you to search by plant type, zone and light requirements are often nurseries so the selection is limited to what they carry (and for part-sun/shade plants...it can get really limited).
Enter National Garden Association's Plant Finder. Whoa. You can even search by color of flower! Color of foliage! Special features! Bloom time! My search of zone 7, part-sun, perennials yielded FOUR pages of results.
It's like a dream come true...