How to jump to a registry key directly ?
When you start Regedit, 
it automatically opens the last key that was viewed. (Registry Editor in Windows XP saves 
the last viewed registry key in a separate location). If you wish to jump to a 
particular registry key directly without navigating the paths manually, you may 
use any of these methods / tools.
Option 1
Using a VBScript:  
Copy these lines to a 
Notepad document as save as registry.vbs
| 
'Launches Registry 
Editor with the chosen branch open automatically 
'Author  : Ramesh Srinivasan 
'Website: http://windowsxp.mvps.org 
Set WshShell = CreateObject("WScript.Shell") 
Dim MyKey 
MyKey = Inputbox("Type the Registry path") 
MyKey = "My Computer\" & MyKey 
WshShell.RegWrite "HKCU\Software\Microsoft\Windows\CurrentVersion\Applets\Regedit\Lastkey",MyKey,"REG_SZ" 
WshShell.Run "regedit", 1,True 
Set WshShell = Nothing | 
Double-click 
Registry.vbs and then type the full registry path which you want to open. [ Example:
HKEY_CLASSES_ROOT\.MP3 ]
Limitation: The 
above method does not help if Regedit is already open.
Option 2
Regjump from Sysinternals.com
This little 
command-line applet takes a registry path and makes Regedit open to that path. 
It accepts root keys in standard (e.g. HKEY_LOCAL_MACHINE) and abbreviated form 
(e.g. HKLM). 
Usage: regjump 
[path]
Example: C:\Regjump 
HKEY_CLASSES_ROOT\.mp3
Option 3
12Ghosts 
JumpReg from 12ghosts.com
Jump to registry keys 
from a tray icon! This is a surprisingly useful tool. You can manage and 
directly jump to frequently accessed registry keys. Unlimited list size, jump to 
keys and values, get current key with one click, jump to key in clipboard, jump 
to same in key in HKCU or HKLM. Manage and sort keys with comments in an 
easy-to-use tray icon menu. Create shortcuts for registry keys.
Option 4
To Jump to Registry key from Internet Explorer / Firefox, 
use my menu extension here: