MR_DIRECTOR  What can I say that hasn't already been said about 1Password? Well, I guess I could say that I rarely purchase software like this—add-on software that claims to "speed up" something I could do myself. But this is definitely a worthwhile purchase.

And "speeds up" is a horrid understatement. I love using it to log into various financial websites quickly so I can check my balances and may bill payments in 10 minutes rather than 30 minutes.

At least try it for 30 days. If you're like me, you'll be buying it within 30 minutes.   
(Version 2.9.21)

MR_DIRECTOR  I prefer ladyTax because, as stated above, the period key doesn't work on the number pad. And that really hinders quick calculations.

Also, ladyTax has the ability to save various sales tax amounts in case you're juggling between counties or whatnot. Very awesome and cool app: http://www.ladybug.fr/ladytax  
(Version 2.0)