This is one for the admins out there who are trying to make their Google Apps suite look good.
I and many others it seems have had trouble using a logo with a transparent background on their google apps domain. Some suggest hacking into the code of the page itself, but far easier is the solution I found here (as long as you have the appropriate software).
When I was saving the picture using Adobe Fireworks, the picture always seemed to lose its transparancy once I uploaded it. Instead, open the file in Photoshop and save it using "save for web". I have no idea what it does differently, but it worked for me!
Via: http://www.google.com/support/forum/p/Google+Apps/thread?tid=5299fcb20c585b03&hl=en
