Just thought this may help some people. I have downloaded an andriod app for my phone that helps you reocrd your peak flows readings. I am useless at writing it down and found this was so easy to do and I have been using it for the past month. It always charts your flow, allows you to set med reminders and does a variety of other things, My asthma nurse and doctor loved it too as it shows 4 different charts.
The app is for andriod called asthma check (~ its blue and white) I don't know if there is the same for an apple/itunes app!
Hope this is of use, Gill.