Designing and developing an application is only the first step when creating a shareware app. I just sat down and wrote a list of items I have to take care of before releasing version 1.0. 

• Website - I used Wordpress in the past, but I’m thinking about moving to a CMS (Drupal and Joomla are on my short list)
• Application Icon - The current icon is only a temporary icon and I’ll have to find a good and hopefully cheap icon designer for this job.
• Payment Processing - Including licence key generation and probably a lost registration lookup system.
• Documentation, FAQs - Creating a good documentation/FAQs helps keeping the amount of support emails down.
• Marketing - Creating entries on Apple Downloads, Versiontracker and MacUpdate is a must, sending out a press release and providing major blogs with free licence keys is probably a good idea.
• Legal Stuff - Founding a company, creating an EULA and so on …

Other things that may become important: bug tracking database, support ticket system, forums, mailinglists