Thyme is a big bee attractor, along with rosemary and many sages.
Pollination: I planted chamomile and thyme, hoping to improve pollination (plants with lots of flowers, or flower-heads made up of clusters of tiny flowers). Too early for me to tell yet!
The generalizations I've read say that white or blue flowers tend to attract bees, Red flowers attract hummingbirds, and plants with flat, landing pad-like flowers are "designed" to be attractive to butterflies. The big weird shaped flowers tend to be moth (or other) pollinated.
The best bee attractor I've ever planted was Honeywort (Cerinthe major 'Purpurascens') or Blue Shrimp Plant, Blue Wax Flower...
Honeywort (PlantFiles link)
Boy the bees just went crazy for it! Other plants in the same family, like Borage, BlueBells, and Echium seem just as attractive to bees.