[Amedee]

I am keeping track of all my trades in a diary in excel and I drawn my PnF charts by hand in excel (where I can add additional notes).
Nevertheless, I am still looking for a better diary system...

I came along this app which look very professional. It's not only about position sizing but it is also about the overall risk involved (open risk) according to the methods of Alexander Elder.
See this trading diary manual
and this review

One can download the lite version app for iPad to try.
The full version is about €100.
I think this one is worth the 'investment'.

Any other ideas or suggestions?