I was a payroll clerk for 20 years in the Navy. It sounds boring as hell, but the military payroll system was as complex as the tax code and it could be fun in a wonky sort of way. Also, twenty years of explaining to people why they were getting paid what they were getting paid or why they were overpaid and that they had to pay back the overpayment gave me some fantastic communication skills that really paid off in my second career.
After leaving the service, I leveraged my paperwork administrative skills over a two year period into a computer network administrator position. Then in 2002 I used those skills to start my own sole prop. IT consulting gig. Basically I'm an out-sourced IT department for lots of small to medium size businesses who don't want to hire someone full time. This is where those communication skills I learned earlier really come in handy. Most IT guys have a very difficult time communicating with end users as hilariously displayed in the Saturday Night Live skits and in the Brit sitcom "The IT Crowd". So my clients are very happy with my work.
The great thing about having the IT skills (as I mentioned before) is that even after I decide to "retire" from my clients, I can use my skills for barter any time I feel like it.
Edit: Like HSpencer, at 50, I'm way past ERE, but it's fun reading and learning along with everyone else.