Just uploaded Beta40 and I think the program is reaching the point of release!  

If your after feedback ,one thing I noticed when using it is there is no filter for manufacturer, handy if you have a big collection

You can add manufacturer in the Notes field. Pinhead will filter on that if you use the Find Machine screen. Filtering in this field will take place on De******ion, Notes and Type (pinball, arcade, etc).

Try out the latest Beta, it has a lot of small improvements and a couple of bugfixes, especially for the Windows users.
 
EDIT: I also uploaded a short users manual!