Small, Virtual Sysadmin Services?

treesim asks: "I work for a tiny research company of five employees, with a growing need for a system administrator. However, our needs are unlikely to ever require a full time person, so I'm wondering if small, offsite sysadmin services exist (something like virtual assistants, since the larger corporate-sized outfits are just too much). On one hand, this seems an obvious niche to be filled by entrepreneurial moonlighters, but there are a ton of questions regarding trust. Nonetheless, we already have good relationships with offsite bookkeeping and payroll services. Am I just being naive, or does anyone have experience with outsourcing small-scale sysadmin tasks?"