The Ultimate Messier Object Log 3
With release 2.2, the Windows version seems to finally have got ridden of the bugs who afflicted it.
This is a nice application to record and organize the observations of the Messier objects - which are also described and show on individual location charts and photos. Mac and Palm OS versions are also available. See a screenshot.

AstroByte Logging System
The AstroByte Logging System is an easy to use database to keep all your astronomical observations together in one package. It contains over 10,000 of the best pre-selected objects along with a form to enter new selections. It keeps track of objects, which you have observed, along with objects that you still need to observe to fill a catalog.
Contains 6 different Database entry forms; 40 printable reports and data for each object to help you locate and identify.
The best logging tool around. See a screenshot.

Messier Logging System 1
Includes the 110 objects of Messier's Catalog. For each and every one, provides an extended description and a photo; as well as location, size, magnitude and distance. Allows the user to record his own observations by providing a practical input system. See a screenshot.