[migrantgeek]

I am doing the same thing right now. I had a lot of trouble billing. I'm just horrible at recording everything.

Now I have something like a retainer. The idea being that I get paid X dollars per month that includes 15 hours of work. If I end up working more than that, I bill $150 per hour. Because this customer is very low maintenance, I've never done anything near 15 hours in a month.

I think I actually get paid slightly less but it's more predictable for both parties.