Assuming the reason you want to install from the PC is because you don't have a wireless (wifi or cell) data connection available, you should be able to establish a USB network link and install software on the tablet using the PC's internet connection.
-connect usb
pcsuite-mode
-on n900:
sudo gainroot
ifup usb0
check the internet connection for 'dummy network'
check the DNS in resolv.conf
-on PC:
set/use USB-IP in same range (ifconfig)
open ports by adding iptables-forwarding for usb-ip's
...now you have an internetconnection and you can ping ex. www.nokia.com
I am porting the GUI by a VNC-server on my N900 and my VNC-client on my ubuntu can login by usb
changing addressbook or installing apps on my PC for my N900 is now possible
come one w8 a minute . i ve seen ppl whop downloaded easy debian from there computer , and then copied it to MyDocs and installed it from there. Am i mistaken or what?