Dave,
There are a lot of shopping options throughout Walt Disney World. At the BoardWalk you are going to find most are focused on food and drink options, but here is what you can find;
BoardWalk Shopping Options
ESPN Club Store
Lots of ESPN-branded clothing, hats, sports memorabilia, and related items. Fun for browsing.
BoardWalk Character Carnival / Screen Door General / Thimbles & Threads
This is really one long store with three different facades. It basically serves as the BoardWalk Inn resort's general store, as other resorts similarly have. It sells packaged foods and beverages, clothing, collectibles, toys, and other general souvenirs. I think it is one of the better resort stores.
Wyland Galleries
This is one of the artist's store branches at Walt Disney World with marine-inspired art that ranges from paintings to sculptures.
After that you are talking about Seashore Sweets (ice cream and other great dessert items), the Bakery (breakfast foods, coffee, sandwiches, and other baked goods), and other food stands for getting food and drink while you enjoy the ambiance.
I hope that this helps? If you have any follow-up questions, please feel free to send them along!
Have a magical vacation!