I love using my Zire 72 for reading and writing email on the go, using two great freeware tools. First is e*Mail, a wonderful Palm Mail client replacement from Ikeda Shigeru that offers up to 32k HotSync message truncation size versus Palm Mail's minimal 8k, and much more! This increase in message size really makes HotSynced email practical.
While PC users get a Mail conduit by default, Mac users do not. However, QueueSoft offers Mac OS 9 and Mac OS X Mail conduits that can sync with Outlook Express, Entourage or Apple Mail. All but the Entourage conduit ($9) are freeware and work great.