I record my observations into a digital voice recorder. This makes each
recording (observation) it's own file, which I then store on my home
computer. I make a directory for each observing run and dump the recordings
into it.

After recording, I transcribe the notes into Skytools, which is an excellent
way to keep track of logs. Once the logs are in Skytools, you can search by
night, location, observer (there could be more than one person's logs in a
given database), object type, constellation, or any combination of those and
other criteria. It's wonderful!

-Astrosetz
www.astrosetz.com