Setup an Error/Bug Reporting Solution

Use Github’s issue tracker, or JIRA, or anything. Keeping track of issues, enhancements, and bugs in progress helps tremendously down the line.

Setup a Contact Form

Simple email forms or using other services like Reddit or even forums can help users give you suggestions and criticism.

Document how the application works, the deployment progress, and anything else you can! Those who do future maintenance will thank you.

Have a backup strategy and a restore strategy.

Use Subversion, Mecurial, Git to version control your files. Preferably Git ;) .

Getting any type of tests is very useful, especially acceptance testing and integration testing.

Log any application errors, user errors, exceptions, etc.