I did tech support for Intuit a few years ago. TurboTax is a very simple program to use when you stick to the interview format. I usually buy the boxed program so the disk is handy for reference in later years, as you need the program for the specific year installed in order to pull up the file (2003 data won't open in TurboTax 2004). For the same reason, when you download software updates (free) and state programs (depends), be sure you burn those to CD and keep them with the program disk.
I actually switched to TaxCut a while back because Intuit stopped allowing installation on multiple computers, and I needed to install at work in order to print the file. That fiasco has passed, however, and I will probably go back to TurboTax this year. The programs are basically the same, but it's nice to get the package deal with Quicken.