If you need to change the firewall port on SSHD for MacOSX Leopard 10.5
Follow the instructions below
Open Terminal and as edit the file /etc/services (as root)
sudo pico /etc/services

Scroll right down to the bottom and add the line
secret-ssh portnumber/tcp # secret SSH port

portnumber being your desired port number, when this has been added press [...]

This is a little tutorial on how to turn SSH on in Leopard MacOSX
First open System Preferences
Click on the “Sharing tab”
Down the left hand side of that windows you should have a list of services, on mine non of them were ticked, but the one for SSH is “Remote Login” put a tick in the [...]

  After the whole phase of the Leopard running on my Dell GX620 i decided to go official…I have now moved away from Windows (well kinda i still have one XP Machine) but that is only because my Netgear Pig isnt compatiable with my new iMac. I decided to do it right and went for [...]

hdiutil convert /path/to/filename.dmg -format UDTO -o /path/to/savefile.iso

Replace /path/to/filename.dmg with the path and name of the existing .DMG file,
and replace /path/to/savefile.iso with the desired path and name for the converted image.

I was browsing the internet looking for Mac tweaks and came across this one, not had chance to try it yet, but will be doing as soon as i get home, i picked the info up from http://www.flickr.com/photos/t_trace/2060171212/ 
When you are browsing through Finder, you can hit your spacebar or click the "Quick Look" button to [...]

How to change the computer name of your Mac in OS X Leopard.
1. Open System Preferences.
2. Open Sharing under Internet & Network.
3. Enter a new name in the Computer Name field.

Boot into single user mode (press Command-S at power on)
Type fsck -fy
Type mount -uw /
Type launchctl load /System/Library/LaunchDaemons/com.apple.DirectoryServices.plist
Type dscl . -passwd /Users/username password, replacing username with the targeted user and password with the desired password.
Reboot

This allows you to reset the password in single user mode without booting from the install media.

From the Apple menu, select System Preferences… .
In System Preferences, from the View menu, select Accounts.
On the bottom left side of the window, click Login Options.
On the right side of the window, check the box next to Enable fast user switching.
On the sheet that drops down, click OK to save the change.
The name of the account [...]

If you have a Intel wireless card and are running osx86 i stumbled across this site where you can download some .dmg files
I havent personally tested them as i dont have a wireless network card, but let me know if you find them usful and if they have worked for you

I just tried this fix (as below and just killed my osx86 install. Not giving it another reinstall tonight, so will be trying again tomorrow.
Im going to get this D600 working fully!
PCMIA/Cardbus fix for 10.5.2:
Install kext from here
Use this utility (Kext Helper) to install kexts here