Here is a good list of RUNDLL32 shortcuts / commands that can be used in Windows 7 and Windows 2008 (most also work in Vista and Windows 2003).
Add/Remove Programs
RunDll32.exe shell32.dll,Control_RunDLL appwiz.cpl,,0
Content Advisor
RunDll32.exe msrating.dll,RatingSetupUI
Control Panel
RunDll32.exe shell32.dll,Control_RunDLL
Date and Time Properties
RunDll32.exe shell32.dll,Control_RunDLL timedate.cpl
Device Manager
RunDll32.exe devmgr.dll DeviceManager_Execute
Folder Options – Opens to General Tab
RunDll32.exe shell32.dll,Options_RunDLL 0
Forgotten Password Wizard (requires removable disk)
RunDll32.exe keymgr.dll,PRShowSaveWizardExW
Hibernate
RunDll32.exe powrprof.dll,SetSuspendState
Keyboard Properties
RunDll32.exe shell32.dll,Control_RunDLL main.cpl @1
Lock Screen
RunDll32.exe user32.dll,LockWorkStation
Mouse Properties
RunDll32.exe shell32.dll,Control_RunDLL main.cpl @0
Map Network Drive
RunDll32.exe shell32.dll,SHHelpShortcuts_RunDLL Connect
Network Connections
RunDll32.exe shell32.dll,Control_RunDLL ncpa.cpl
Power Options
RunDll32.exe Shell32.dll,Control_RunDLL powercfg.cpl
Regional Settings
RunDll32.exe shell32.dll,Control_RunDLL intl.cpl,,3
Stored Usernames and Passwords
RunDll32.exe keymgr.dll,KRShowKeyMgr
System Properties: Advanced
RunDll32.exe shell32.dll,Control_RunDLL sysdm.cpl,,4
Taskbar Properties
RunDll32.exe shell32.dll,Options_RunDLL 1
User Accounts
RunDll32.exe shell32.dll,Control_RunDLL nusrmgr.cpl
Windows Security Center (Windows 7 only)
RunDll32.exe shell32.dll,Control_RunDLL wscui.cpl
Windows – About
RunDll32.exe SHELL32.DLL,ShellAboutW
Unplug/Eject Hardware
RunDll32.exe shell32.dll,Control_RunDLL hotplug.dll
Windows Firewall
RunDll32.exe shell32.dll,Control_RunDLL firewall.cpl
Wireless Network Setup
RunDll32.exe shell32.dll,Control_RunDLL NetSetup.cpl,@0,WNSW