I think I must be one of the last few people left who's still using OS 9 on a Mac G3 laptop! I'm using Entourage (and will continue to do so when I upgrade to a new Mac and OS X later!). I use its folders feature for each client I work with. Within that one folder I have 2 - one for work to be done/changes to current work and one for quotes/costings etc.I use the Calendar to prompt me for upcoming deadlines, meetings, to call, to email etc. I don't use a PDA. I sold my iPAQ when I realised I'm a pen and paper gal, so all my notes and schedules are transferred between my Calendar and Filofax. I don't think you'd need too many digital apps. Keep it simple. I find the stuff that my Mac has is enough to keep me and my design jobs organised. Folders are good.