I've been using my "You Decide" fill-in-the-blank invoice, for over a year now.  In that time, I've found time and time again that my clients pay me more than I would have charged them.  And, in situations where clients demand a fixed price, I'm quoting them much higher prices (coupled with a money-back guarantee) than I would have before my invoice experiment.

Even though I've been doing flat-fee work for almost a decade, I used to (even subconsciously) focus on the time it took me to do something.  Now, everything I do is focused on delivering the biggest "bang" for my clients, knowing that the "bucks" will come.  I don't track phone calls, preparation time or limit meetings, and I don't charge for materials, travel, meals or other expenses.  In short, I trust that my clients will take care of me if I take care of them -- and they always do.

In 2010, I'd encourage you to resolve to let your clients set your price -- at least once.  Ask a trusted client to list all the services they'd like you to provide for them.  Suggest unlimited phone calls, regular meetings, document reviews, etc.  Provide all these services to them for a month's time.  Then, ask them what they're willing to pay for all the work you've done.   

You may find your clients value your services more than you do.