Help me explain to my bosses why PC bridging is bad !

Hi,
At my company we have a lot of wireless broadband connections that users can connect to from their laptops, whilst also being connected to the corporate network. The broadband connection is natted, but thats the only security there is.
I'm trying to convince my bosses that this is bad, but need seem examples of how this can make the network vulnerable.
I'm not a security guy, but I can see how this could be a problem.
Could some of you experts out there give me some ammunition to fire at my bosses please ?
Thanks
Lee

"This network only provides broadband Internet access and has no connection to the corporate net, other than through the PC."
What do you mean "other than through the PC"? I mean, that's really the whole issue. A PC is just a few clicks away from becoming a router. You're network path used to look like this:
Internet<->Firewall<->Proxy<->Notebook
Now it looks like this:
Internet<->Firewall<->Proxy<->Notebook<->Wireless<->NAT gateway<->Internet
Because of mobility, notebooks often present other challenges as well. IME, they are not patched as timely as regular workstations. They are used away from work and in hostile environments, like hotels and airports, and tend to get infected with malware more frequently (i.e. surfing higher risk sites when I'm at the hotel...porn).
If I gain access to the wireless network, I would typically have unfiltered access to any nodes on the wireless network. In your scenario, that includes those higher risk notebooks which are also directly connected to your internal network (i.e. I completely bypasses all those carefully implemented firewalls and proxy servers you mention). If I can compromise one of those hosts, then I will likely have full network access to your internal network.

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