I'm a minor entrepreneur and also an "amateur" Linux sysadmin (OS installation including RAID, monitoring using Nagios, building various software from source + applying patches, installing development stacks, custom monitoring cron jobs, firewall configuration, mail server setup) with experience with Ubuntu/Centos and Plesk/Virtualmin.
Q&A for professional and enthusiast programmers
Q&A for computer enthusiasts and power users
Q&A for professional system and network administrators
Q&A for peer programmer code reviews
Q&A for power users of web applications
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
Q&A for pro webmasters
Q&A for professional programmers interested in conceptual questions about software development
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Q&A for Information security professionals
Q&A for Ubuntu users and developers