I am so incredibly horrible at estimation that I bid more with emotion.
If I find the project very interesting and I can fall in love with building it, the client is going to get a good deal. Boring or otherwise tedious projects engender some stone-cold, take-it-or-leave-it negotiation. I mean, this is my free time.
A great tool that I've come across for helping out with setting your rate is at http://freelanceswitch.com/rates/. It got me thinking of many areas of expenses that I hadn't considered.
It is geared more to those of us doing it full-time.
It's a good summary on a several techniques, how to apply them, and how to pick how in depth of a one to do, as well as how to talk with people who try to negotiate with them.
If I find the project very interesting and I can fall in love with building it, the client is going to get a good deal. Boring or otherwise tedious projects engender some stone-cold, take-it-or-leave-it negotiation. I mean, this is my free time.
Edit: Nevermind that extra bit, however true. :)