I am using PocketPC smartphone HTC Touch (I think in US Sprint Touch). In terms of Software I am using MyLifeOrganized which has a pocketPC add on. Our office allows both Blackberry and PocketPC use. I use Blackeberry as well for e-mails, Calendar and Contacts. Do not use it or Outlook for ToDo, project lists. At the moment I am trying to implement ZeroInbox recommendations from this site with a mixed success (I get 500+ messages a day). Finally I mostly use smartphone to add actions and look through lists on the go. For more detailed things, reviews etc I am using software on my computer. Apologize for a long reply.