Compaq Ipaq is a very sweet little machine, I use mine all day at work for normal Day Timer duties, along with keeping many Excel or Word documents on the 128mb CF card.
You can also watch Mpegs, listen to MP3's, play games, use it as an IR remote (wouldnt recommend it though, range sucks on all the PPCs), go wireless and use Blackberry (read your emails on the go), if your company uses an Avaya PBX, the new version 10.5 or 11 will allow just the IPAQ with wireless setup to act as your work phone.
In a nutshell, I have always had a HUGE daytimer, with over 1 1/2 years worth of crap that I usually always had to refer back to, the IPAQ took care of that, along with giving me the ability to view everyday files on the go (having internet functionality isnt bad either).
My 2 pennies....
ReaperVelle