The iMacG5 has 2 memory slots. But contrary to the PMG5, it is possible to install 1 or 2 DDR modules of different size. But in this case, the memory bus will be working only in 64 bits mode. Only if both DDR modules are identical, that it will work as 128 bits mode. In other words, performance of your iMacG5 will be dramatically impacted if you do not install 2 identical DDR modules.
Warning, identical DDR modules imply both same size (i.e. 256, 512 1024 MB) and same specs (i.e. latency).
CDfreaks is proposing on its homepage an OSX compatible API allowing users to flash their NEC burners. Up to recently, to install a new or region-free firmware, it was necessary to connect your burner to a PC. All interfaces are supposed to be supported: IDE, SCSI, FireWire and USB. Warning: this is a raw API. There is no GUI, and up to now we have no report of a test.
http://uniflash.cdfreaks.com/
PC oriented websites were so much raving about the Logitech MX1000 that we just had to try it out for ourselves. First of all, it works fine "out of the box" on OS X, all the buttons are configurable for exposé and for games.
Even compared to the excellent MX 700, this mouse shines by its precision. On a big screen, with the acceleration set to maximum, one can go from the top left to the bottom right without moving anything else than the wrist, which is very comfortable.
Once the drivers are installed, the finer settings are available :

Once again, Logitech leaps ahead of the competition, with a mouse which price is equivalent to Apple's Bluetooth mouse, but offers an uncomparable set of features.
Thank you Cyberdid for the heads up.
Every Mac has an identification number written somewhere onto the machine, that's the same number that is revealed by double clicking on the OS version in the "About this Mac" window.
With this number, you can determine :
- the machine type
- where the machine has been assembled
- the week that it has been assembled
Decrypting this number wasn't all that easy, but one website made that easy :
Enter your serial number at the following page
http://www.chipmunk.nl/klantenservice/applemodel.html and all the details of the birth of your Mac will be revealed to you !

kurisu adds : Actually this will work with ANY Apple product. I just tried with my iPod mini, and I now know that my mini was produced in Japan ! kinda ironic considering I bought it on ebay from the US !
Whistle Master did a really cool thing, and created a HardMac search plugin for FireFox. Once installed, (and FireFox has been restarted) you can search all the articles of HardMac right from the search field of your browser !
This is of course cross platform, and can be used on any FireFox supported platform.
you can download the plugin from
this page.