I recently mentioned using PZTLog which has been the work of Charlie M0PZT. This is an extremely well done logging program and on the plus side, is free. Don't let the "free" part dissuade you in any way. Charlie has put together a magnificent piece of software that will compete with any program that you would pay for.
There's another one that I have been playing around with that is also free. This one is called LOG4OM and has been written by Daniele Pistollato IW3HMH.
This program is also very good. It is a little more basic than PZTLog and was written more in mind for the Ham who might be considering moving away from paper logging to computer logging. It's no slouch of a program, though. It has many great features - ADIF import/export, mapping of QSOs, labeling, onboard DX Clusters, rig control, etc.
If you have been searching for a logging program and haven't found one that quite fits your needs yet, I would highly recommend giving each of these a look.
The price is right!
72 de Larry W2LJ
QRP - When you care to send the very least!