Hi,
I've been working on a similar project.  Like lewjeff, I try to keep track of cooking sessions from start to finish.  I started with simple hand recordations of  observations and notes then entering the data in an Excel spreadsheet.  It wasn't long before the data I wanted to record required a more efficient method of recording.  So I started using one of those hand held micro cassette things.  I could replay the tape next day or even a week later and enter the data into the Excel spreadsheet.
About a month ago I started moving the data from Excel to Access.  I could see that I needed a better way to retrieve specific cooking sessions for comparison, VB forms to present the data online and better links to multimedia components.
I don't have a Palm Pilot but I quess that data could be downloaded from Access to the Palm or visa versa.
I also am researching, though not ardently, a nice digital hookup between a pc and weather recording instruments.  Between a Polder type thermometer and the pc is still a dream right now.  It seems if they can make sending and receiving units then it shouldn't be a big step to hookup to a pc.
I'll pass along anything that I have to those who are interested.
Brian