Below is a link to an interesting survey done by the journal of accountancy regarding the usage of various tax software programs. Even more intersting is the link to information about each of the individual programs in the survey. The link provides very good information about each of the program's cost, abilities, and enhancements.
http://www.journalofaccountancy.com/...ntent=My+Yahoo
http://www.journalofaccountancy.com/...ntent=My+Yahoo