Online education and training: an area ready to grow with no clear leaders
New and used clothing and accessories: Thrift-style stores are successfully moving online.
Specialized books: Competing with Amazon.com and Barnes & Noble means focusing on a specific area, especially on used, rare and antique books.
Hobby and craft supplies: The big brick-and-mortar craft store chains haven't cornered the Web yet.
Web publishing: desktop publishing services with an online angle
Niche auctions: the more specialized, the better. A tip: Offer intimacy over eBay's bulk.
Business-to-business sales: Look for business beyond consumers.
Software: a popular product to buy online from retailers large and small
Imports: From art to rugs to decorative items, imports are in demand on the Internet.
Specialty and used CDs and MP3s: The future of music (and music retailing) is online.