Internet Explorer

Disable IE just in time debugger
[HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main]
"Disable Script Debugger"="yes"

Auto-Complete
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\AutoComplete]
"Append Completion"="yes"

Disable IE updates check
[HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main]
"NoUpdateCheck"=dword:00000001

Change IE Start page
[HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main]
"Start Page"="about:blank"

Adds search keywords to Internet Explorer
[HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\SearchUrl\MSKB]
@="http://support.microsoft.com/?kbid=%s"
[HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\SearchUrl\AV]
@="http://www.altavista.com/sites/search/web?q=%s"
[HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\SearchUrl\Ggl]
@="http://www.google.com/search?q=%s"
[HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\SearchUrl\MSN]
@="http://search.msn.com/results.asp?q=%s"
[HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\SearchUrl\FM]
@="http://www.filemirrors.com/search.src?file=%s"

Prevents Internet Explorer windows from being reused
[HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main]
"AllowWindowReuse"=dword:00000000

Max your Internet Explorer's simultaneous downloads to 10 (default was 2)
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"MaxConnectionsPer1_0Server"=dword:0000000a
"MaxConnectionsPerServer"=dword:0000000a

Enable username:password@site.com in Internet Explorer and Windows Explorer.
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_HTTP_USERNAME_PASSWORD_DISABLE]
"iexplore.exe"=dword:00000000
"explorer.exe"=dword:00000000

Change IE's title bar caption
[HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main]
"Window Title"="[deXter]s SuperTweaked IE"