UPDATE: New tool "Remove Watermark" added. Thanks to stavros for mentioning it...
When we install a Beta or RC build of Windows Vista, 7 or Server 2008, or when we install a Beta or RC version of a Service Pack e.g. SP1, SP2, etc, a watermark is shown on Desktop which looks similar to following screenshot:

"Evaluation Copy", "For testing purpose only", "Test Mode", "Safe Mode" or similar text is shown in the watermark on Desktop.
It looks ugly when you use dark wallpapers and becomes irritating sometimes. If you also don't like this watermark and want to get rid of it, here are 2 great tools to remove this watermark:
- Universal Watermark Remover
- Remove Watermark
Universal Watermark Remover
"Universal Watermark Remover" is an excellent small and portable utility created by "Orbit30" which can remove the ugly watermark from Windows Vista, 7 and Server 2008 Desktop. It works for both 32 and 64-bit versions of Windows.

Just download it using the above link, run the EXE file and follow the instructions. You'll need to restart your system to take affect.
Remove Watermark
"Remove Watermark" is another awesome portable tool created by "deepxw" which can remove watermark from Windows Vista, 7 and Server 2008 Desktop. It works for both 32-bit and 64-bit versions. Even it works for all languages and service packs.

Download the ZIP file, extract it and run the correct EXE file for your Windows version. It'll ask for confirmation, press Y to confirm and patch the system file to remove watermark.
64-bit version users will also need to rebuild MUI cache. After patching file, run the tool again and press R to rebuild MUI cache.
PS: You can also manually remove the watermark or customize watermark using following tutorial:
Show Your Desired Text on Desktop by Customizing Windows Watermark (Build Number Info)
This article was posted by VG in following section: Software, Troubleshooting, Windows 7, Windows Vista.
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Paul Kevin
Wow, this site is so great. This site is full of articles about tweaking with windows. I have seen your profile in Microsoft's Most Valuable Professional and that was a big honor for you to be recognized as one of the best professionals worldwide. I hope you continue to inspire more people through your amazing works.
Darshit
We can remove the watermark using the registry too na?
I remember there is such a way, dont remember the exact key right now...
ed
this tweak no longer works with build 7100, any alternative?
t2
the link cant be access
Invalid name
The link are dead -__-"
caleblargo
um i tried it and it didn't work :( and yes i restarted my comp. i have rc 7100
kooolsrule
Its not working for me too
Installed windows 7 rc build 7100 in d drive along xp in c,
Is that the cause of problem?
caleblarg
hmm i have it on 2 drives too. i had vista on c, xp on d, and when i installed 7 over xp, it changed it to c drive and vista is now on d.
Blue
Does not work at all on Build 7100. >:\
Max Delér
THIS WORKS!! LOVE ORBIT30!!
Thank you soooo much dude.
Love you!