Used to use printed spreadsheets, until it got annoying keeping up with printing new ones. Switched to a Google Document, that way multiple people can access it easily and it won't get accidentally lost. I have checked out iHerp before, but never found it interesting enough to bother switching (that being said I have never really looked into it very hard) and IMO its not worth buying a program when a spreadsheet can do all I need it to do.