[fvox13]

If you're a web developer, one of the single biggest sources of recurring revenue can be web hosting. I charge $100/year to most clients for hosting... you get 30 small sites on a $10/month VPS and that's a lot of profit for not much effort.

[bdunn]

Add to that:

* I'll be available to apply any security patches as they become available without the need to draft a Statement of Work.

* I'll make sure backups are happening as they should.

* [If your project is public facing] I'll run your split tests and continuously optimize based on the data we collect over time. I'll send you a PDF report at the end of each month that details where you were the month before, what's changed, and what the impact (uniques, engagement, financial, etc.) was to your business.

* ...

Now you're looking at a product that your non-active clients can subscribe to that delivers insurance (hosting, backup monitoring, smart-guy-with-root-access) and continuous refinement.

Throw a $XXX/$X,XXX price tag on it, set up automatic invoicing, and you now have recurring revenue.

[patio11]

Gah, where was your #3 when I was doing A/B testing engagements twice a quarter... Seriously guys, star that advice, it is fantastic.

[damoncali]

Be careful about this - make sure you have an exit plan if you decide you want to stop freelancing. It can be a real pain if you don't have each client on a separate box.