Why does one of my MacBooks show up as an IP address on Airport Utility

Hi-- This seems tangentially related to a previous query --- or at least it came up as a result of a previous query, but I thought I'd offer the query in a new discussion topic: 
In setting up my Airport Extreme (coupled with Express) network, my printer, and the rest of it, I open the Airport Utility and I'm given the run down (i.e. schematic) of the network with the icons (i.e globe for internet connection) and the two Airports (extreme and express) that constitute my network.  And when I clicks either of the two icons for the Airport Extreme and Airport Express, there are little windows that pop up to show the devices connected to each Airport device.
All the devices isplayed as connected have names (like Joe's-Ipad or Jane's-iphone or Joe-Blows-MacBook-Pro.local) except for one which just has the IP address 10.0.1.8 and that device is one of my MacBook Pro laptops.
Why does it display the number rather than the name of the device?  I've installed the relevant OS like I have on all other devices, and I've named that device within the OS.  Further, when the "numbered" device (i.e. Macbook Pro) is connected via Firewire to another Macbook Pro, it will show the device name of the one in quesiton, but in Airport Utility it just gives me an IP address. 
Why is this?  Not a pressing matter, but I am curious.  Also, why isn't the printer shown in my network via Airport Utility?  Or is it?  I have one other IP address for a device I haven't been able to identify (10.0.1.6) but I thought it might be another iPhone which is connected to my wifi.
Hopefully, I've present my query in a coherent way.
Thanks for your thoughts on this.

Hey there, mine is now working!
I'm afraid I dont have an absolute solution for you though.  I had the account setup on several devices with no luck then someone else removed and re added the account from one of the ipads. it started working straight away on that one then a few days later emails started coming through on the other devices too. 
I have seen a few posts around that suggest you need to add and remove the account several times before it will fix itself and start working...  maybe try that.  Also, if you are going to upgrade to iOS5 it would probably be worth removing the account before you upgrade then re adding it once you have.  That way you can be sure there are no legacy cached issues causing your problems..?
Good luck!

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