Yola, a San Francisco software company, is discounting the professional edition of its website building application over the Thanksgiving holiday. Yola Pro, which typically costs $49.95 a year, lets you create up to 25 websites with 5 GB of storage per site. Yola Pro will be on sale for 50 percent off from November 26 through November 30. To take advantage of the sale, go to Yola.com and enter the promotional code: yolaprohalf.