Online only here.
we use gmail and the calendar facility there extensively. Hubby and I have a our own profiles, and we can see each others calendars so know where each are. Ive recently set up one each for the kids.
I had a similar diary to yours Deb and absolutely loved it. it had everything in there, and I used it heaps. After I set up the calendar online though I started using that more and more and the diary less and less. Then one day I realised I had been buying them every year, and had not touched it in 3 years.
so that was the end of that.
At first I accessed it just at work and home, but that seemed to be enough for me, but now that I have a smartphone, i access it there most often.