Asthma Logbook X is a free, or charity donation-ware, logbook for tracking and reporting asthma related events: peak flow level, inhaler puffs/units (for two inhalers), medication taken, breathing difficulty, general health, events and notes.

It's your data so you can export the data as a text file and re-import data, currently only from Asthma Logbook X export files.

Five types of reports are available: detailed list, summary lists for each day period, peak flow logbook, plus graphs and notes.

Asthma Logbook X is freeware, but donations to Diabetes UK, http://www.diabetes.org.uk/Get_involved/Donate/, are welcome as this will help my young son who has Type 1 diabetes.