How do I enable CD burning for Limited accounts?

It is only for XP's built-in CD burning feature.

Allow limited users access to CD Burning:

To allow Limited User's to burn CD's, click Start, Run and enter REGEDIT. Go to:

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon

Look in the right pane for AllocateDASD and double click the entry. Set the value to 2.

On PRO, this is exposed in Local Security Policy under Security Settings\Local Policies\Security Options

"Devices: Allowed to format and eject removable media"

For XP Pro, you can do this by clicking Start, Run and entering SECPOL.MSC

Go to Local Policies, Security Options, look in the right pane for Devices: Allowed to Format and eject removable media. Set this option to Administrators and Interactive Users