
In earlier beta testing days of Windows 7, it was possible to remove the "Blur" effect from window borders (window titlebar, etc) but the functionality was removed in later builds. Even the RTM build doesn't contain this functionality.
We just needed to alter a DWORD value in Registry Editor and the Blur could be removed.
No need to get sad. "PacMani" @ DA has created a small batch script which replaces 2 RTM system files with the beta ones and also incorporates the required registry DWORD values automatically. So you can get the good old Beta functionality back in RTM build.
Before:

After:

Simply download the ZIP file using following link:
How To Instructions:
1. Extract downloaded ZIP file and run "Patch Blur x86.bat" file. If you are using x64 bit version, run "Patch Blur x64.bat" file.
2. It'll take a few seconds and you'll see window without blur.
3. If you want to put the blur back, run "Enable Blur.bat" file. And if again you decide to remove the blur, run "Disable Blur.bat" file.
4. Although you would not need to run "Unpatch Blur.bat" ever, but in case you want to restore the default system files back, run it.
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Roogie
All Gary's method does is increase or decrease the transparency levels which you can do via the control panel. It does not affect the amount of blur.
Willie
gotcha
Afizz
Does it work in 7 RC?
VG
^^ Yes.
AeroRange
It isn't work in mine. Look at this screenshot.
http://farm4.static.flickr.com/3505/3962574793_69015d1a23_o_d.png
VG
^^ Try to login as administrator and then run it.
AeroRange
What do you mean? There are only one user account in my Windows 7. After I tried to "run as administrator", the theme is changed into Windows 7 Basic and I can't get it back to Aero (I must un-patch it to use the Aero theme again).
Sanctum
/\ Same as him, can't get back to Aero theme because when I ran as administrator it went to basic.
Sanctum
Never mind, got it to aero by running as administrator.
Aaron
It says successfully patched, but Aero is disabled.
Running RTM and ran as Administrator.
http://img691.imageshack.us/img691/1222/hideblur.png