<< 
PPCs can also hook onto wired and wireless networks, and use both landline and cellular modems for Internet access. >>
Same with Palm, except for wired LAN (for now). Strangely enough, wireless 802.11b exists.
<< 
Palm's have an awkward way of adding, where basically you need to copy anything to main memory before you can use it. >>
Not correct. With several Palm OS machines you can run programs directly from FlashROM.
<< 
PPCs use a real file system. That means you have a directory structure, and can organize everything in folders. Palm uses a database system, meaning everything is stored in one huge directory, and you can't even really see the file system. >>
While the PalmOS doesn't use a the FAT system internally, it can use it for plug-in hardware. CompactFlash upgrade modules can be read and used with the native FAT file system.
<< 
-PPCs play MP3s and videos, which Palms can't do because they don't have a fast enough processor. The new Sony Clie is able to play MP3s only because they added a special audio processor to it. >>
Strangely enough, you can play videos on a Visor. If you buy a CompactFlash adapter for the Visor, it includes software that allows video playback right off the CF card. Haven't tried this function though, since I so far have no use for it.
Anyways, I do the following with my Visor Deluxe (8 MB):
Contacts (with MS Outlook)
Calendar (with MS Outlook) The alarm has saved me a couple of times.
Notes (with Stowaway Keyboard)
Email sometimes
AvantGo (although nowadays I just read the newspaper)
Databases
Dictionary
Thesaurus
Games (of course 

)
By the way, how long does iPaq last uncharged when the unit is OFF? Just wondering. Never used one long enough to actually find out.