From Yahoo, this is the link, by Dory Devlin:
My take on this: if your tax situation is straightford, go ahead and use the free software. But on the other hand, if you buy and sell stocks, have a home business, changed jobs or moved last year,…you will be better off use the paid version. Another catch is the AGI (adjust gross income) requirement (less than $52,000).
(Update 22Feb07) I got my state tax refund today (filed by mail about about 10 days ago). I used Turbo Tax for federal (got 15% off through ADP) and it took about the same time to get refund. Prepare your tax early, even if you need to send in check (you can always hold it by mid April).