Hi,

Here is my selection below. They are freeware unless specified
otherwise with [Com](for commercial) :

CCLite :
MSN client
Yanoff :
news reader (old freeware version)
TCPMP :
Multimedia viewer : movies, images, music
GoogleMaps :
Maps on the go
HardReset & Softreset :
two softwares to issue the resets without
removing the Treo's battery.
FileZ :
Browse your Palm content, manage files & folders
UniCMD :
same as above, with a different look&feel & more
KeyGTime+ :
alternate lock screen
SiEd :
a real Text Editor on Palm
CardExport [Com]:
Use your Palm as a SD card reader/writer.
Additionnaly, allow the Treo's battery to charge even without
installing the Palm drivers on the computer (It's a shame
Palm does not provide these with PalmOS)
NVBackup :
does backups on SD cards.
IrOff :
keep your infrared device off to save battery.
OnOff Control :
manage the way your Palm stays on or switches off.
OperaMini :
not so nice, not so stable, but can be better than
the default Palm web browser (again : Why Palm did not put
NetFront web browser on Treo's PalmOS ?)
NetFront [sort of Com] :
THE BEST WEB BROWSER ON PalmOS. Unfortunately avaiable
only on Sony Clie. Once you've tried it, you miss it if
you don't have a Clie... (some people found a way to have
it running on T5, TC, TX...)
UDMH [Com] :
defrag Palm's memory
PalmPDF :
View PDF document as is (usefull when received by email)
SmbMate :
connect to Windows shared folders.

Also, but not killer's app but I like those anyway (all are commercials):
- TomTom GPS/Mapping
- NoviiRemote (Universal IR remote control)

Enjoy,

Charly