Are your PC and the server on the same subnet? What is the IP of your PC? You can check that with ifconfig or ip addr.
And there's no firewall on the PC. And the fact that the iptables command is not found on your server probably means iptables isn't installed at all, so no firewall either.

You can check if there are any firewalls running on both your machines with the command iptables -L assuming that you did not install a firewall that doesn't use iptables as a backend, which I don't think is the case.
Can you try to telnet to the plug on port 631: telnet 192.168.0.102 631 ?

Hello Jeff, do you have a firewall running on the plug? The default installation of Ubuntu does not have a firewall enabled BTW. And most firewalls monitor incoming traffic in particular, so if you happen to have a firewall running on the PC from which you try to connect to the CUPS URL it shouldn't block port 631. But you could always check to be sure sure.

Hello sunnyboy70, the SheevaPlug comes pre-installed with Ubuntu 9.04, aka Jaunty Jackalope. This is fine for running a simple webserver. The OS runs from the internal NAND memory though. So most Sheevans use an SD card or an external USB drive to run the OS from to prevent the NAND from wearing out too quickly.

qemu can emulate an ARM CPU: http://www.qemu.org/status.html
Not sure though if the Windows version of qemu is able to emulate an ARM CPU, the linux version does support it.

Yes, Ubuntu 9.04.
But it's pretty easy to install another distro (Debian, Gentoo, Fedora). I use Debian myself.

You can get ftp to work if you want to, same goes for a webserver. I use Apache myself with PHP5 (I need stuff like virtual hosting, mod_rewrite and such). Just a simple apt-get apache2 php5 does the trick then. And some knowledge about setting it up, but documentation on setting up a webserver is spread all over the net. If you want less overhead you could try lighthttpd. But you are using the Ubuntu installation on your plug right? For setting up an ftp server you could use this information: http://ubuntuforums.org/showthread.php?t=79588 or https://help.ubuntu.com/6.06/ubuntu/serverguide/C/ftp-server.html

I agree with mgillespie, and the services you mention (torrents, mounting drives and serving media) can be easily handled by the plug. The advantages of the SheevaPlug is that it is the most widely spread and used plug computer at the moment. And judging by the wiki and this forum the user base/community is already pretty solid!

Hello graviton, you need to set up Samba on the SheevaPlug: http://plugcomputer.org/plugwiki/index.php/Share_With_Windows_Using_Samba
Then you should be able to see the SheevaPlug in your Windows Network environment.

Great! Can't help you though setting up FTP, personally I think it's a bit deprecated and unsafe so I prefer SSH.

Hello Jeff, if you installed CUPS you should be able to configure CUPS with your browser, the URL should be http://ip.of.your.plug:631/printers
The web UI is pretty self-explanatory.

Which static IP did you assign to your plug? According to your interfaces file the plug still uses DHCP.

Which OS are you using on your SheevaPlug? If it's Ubuntu or Debian you must have a /etc/network/interfaces file.
And I know close to nothing about any Apple hardware, but I'll try to look up some info on how to forward ports.

Transmission is a torrent client.
And ebp, what brand/type of router are you using? And how does your /etc/network/interfaces look like?