TaxAct
I'll preface this by noting that my taxes were complicated last year because of some shares in a limited partnership that resulted in some weird pass-through gains.
I started out in TaxCut but became annoyed at the number of places it dumped me into the tax forms and asked me to figure things out for myself. I lost confidence in the results and downloaded the free TaxAct. TaxAct did better, but there was one place in the interview that I didn't understand. I upgraded to the paid version of TaxAct so I could get better documentation and phone support, and ended up calling them. They immediately answered, spoke English, and forwarded me to a tax accountant who straightened me out. I can't remember the issue, but I do remember that I was very happy with the speed and quality of the support.
The interesting part was that at the end of the interview process, the tax bill from TaxAct and TaxCut differed by a few thousand dollars. I spent some time looking through how both programs filled out the forms and was eventually able to understand and reconcile the differences. When both programs agreed, my confidence in the results went way up. For anyone with complicated taxes who is determined not to hire an accountant, I'd highly recommend the two-program approach.
TaxAct lacks some of the polish of TaxCut but I'll probably use it again.
TurboTax is forever off my list, after the episode a few years back where they decided to overwrite your computer's master boot record while silently installing their copy protection. That's just evil.