I would expect them to if you run an update.
I switched to wheezy just be editing my /etc/apt/sources.list file to change all instances of "squeeze" to "wheezy" then doing an update. Well, I seem to recall  had to remove an sgml package causing some odd dependency failure, and had to forcibly update one perl package manually, but apart from that it all went OK with several hundred (or >1000 - I forget) package updates.

I have an original (well, v2) SheevaPlug, with the original U-Boot on it.

I've running 3.9.0 with no problem (boot from SD card - all files other than /boot on an external USB drive).

I download your kernels from a different system to the Plug computer.
So running the script produces:
I take it I can just download the relevant files and run the magic in MkImage() to get a uImage file?

You could see whether /proc/config.gz exists and, if so, whether it contains:

  CONFIG_EFI_PARTITION=y

Not sure if that 2.6.30.2 kernel does.  I'm using 3.8.4 from cxbiker61 (see http://www.plugcomputer.org/plugforum/index.php?topic=6202.0#subject_20353 which refers to 3.6.6, but 3.8.4 is there now) and it does.

I was running Debian squeeze with that (until last Saturday, when I did an upgrade to wheezy).

If you haven't seen it, http://www.ibm.com/developerworks/linux/library/l-gpt/ might be useful.

Do you mean the U-boot prompt?
In which case http://www.denx.de/wiki/DULG/Manual would probably be helpful.

Yes: I have I can't remember how I got it installed, though.  But I do remember that it wasn't all that difficult.

Difficult to see how you are going to connect without opening up a port.
If you are worried that someone might be more likely to scan port 8080 looking for this then is your router able to do port translations.  All of the routers I've owned do (although one of them didn't actually document it, or have any Web page to configure it, but you could do it from the command line in the router - they didn't document the commands either...).  That would allow you to connect from some other port number via the Internet, but still use 8080 on your home network.

Would not be a useful response for a video stream, but this is just a snapshot, one-off image?  So your browser reckons it already has a copy of it and it hasn't change since then.
You could go to about:cache in Firefox, find the entry (by uri) and see what it thinks it has.
That's not an image format.  Find out what the client *is* sending.

No - you seem to be trying to use https, which will use port 443 and run SSL/TLS connexions over it.
Have you actually set up your Web server to use SSL?
If not, try accessing http://192.168.1.4:443/mjpg-streamer/stream.html instead (http on port 443, which is not the same as https) and see what happens.  If it works you might like to use another port, rather than confuse everyone.

In the end it turned out I didn't need that kernel module at all.

It's a USB audio device (so that part works fine anyway), and there is a user-level tool that can be used to configure the frequency, etc..  In fact, on my Linux Mint system i have to blacklist the module to stop it claiming the device and preventing the user-level tool from working.

To answer my own post, these two links might help?
I'll test out the principles...
   http://www.cyberciti.biz/tips/build-linux-kernel-module-against-installed-kernel-source-tree.html
   http://www.kernel.org/doc/Documentation/kbuild/modules.txt
(although it is actually an in-tree kernel module I suppose I can always treat it as an out-of-tree one).

Excellent!  Many thanks for these.

Do you know of any way to build additional modules from the standard kernel sources to your with your build?  Just that I'll probably be wanting the radio_keene one from radio/media soon and it might be nice to not have to compile form the start.

Curiosity, not a compliant (how could anyone complain about your kernel builds) but what is the current state of the latest ones?
They seem to be partly there - but Kernel headers are missing...

You can set the MAC address either in the U-boot environment ("hardware) or in Debian "(software").  So it depends on what you have copied.
In Debian you would set it with a "hardware ether" line in the /etc/network/interfaces file.
Of course, it's also possible to hardware ARP table entries as well, so if none of this fixes things you'll need to expand on what you mean by "it is assigned to the address of the previous device").