I always find great things in the swaps but here are some I'd really like to grow:
Achillea millefolium, 'Flowerburst Lilac Shades',
Achillea millefolium, 'Flowerburst Red Shades'
Campanula 'Cherry Bells'
Canna Lily 'Cleopatra'
Cannas with interesting leaves
Centaurea Montana 'Amethyst in Snow'
Cosmos 'Cupcakes & Saucer Mix'
Dicentra - any that are really fresh
Forking Larkspur 'White King'
Hypericum prolificum - Shrubby St. John's Wort
Japonica
Maianthemum racemosum - Solomon's Plume
Sambucus canadensis - Elderberry
Scabiosa 'Fama Deep Blue'
Thalictrum dioicum - Early Meadow Rue
Verbena 'Twister Pink'
Viola sororia f. rubra (Common Blue Violet - Pink Form)