UNetbootin to create F17 LiveUSB without a CD

I have made many Live USB Fedora (F11-F15) bootable pendrive OSs but have always ultimately had to burn the Live iso to a CD first -
I for sure will do that again - if necessary, but now,
I have been trying and really would like to get a bootable (1GB) Fedora 17 KDE stick without first burning the iso to a CD

I have the F17 KDE Live iso downloaded and have made the UNetbootin executable just fine :
http://unetbootin.sourceforge.net/
using the command chmod +x . . .
but I am still getting a boot error with the new USB although UNetbootin completes and finishes seemingly ok.

Anyone here use UNetbootin (specifically with Fedora) successfully ?
- or may the Fedora repository have a better utility (or utilities) that can be yum installed to my F15 KDE to make Live USBs without first doing a iso burn to a CD ?

Thanks in advance for advice - or criticism.