When you type:

cd /? at a CMD prompt, you receive:

"Displays the name of or changes the current directory.

CHDIR \[/D\] \[drive:\]\[path\]
CHDIR \[..\]
CD \[/D\] \[drive:\]\[path\]
CD \[..\]

  ..   Specifies that you want to change to the parent directory.

Type CD drive: to display the current directory in the specified drive.
Type CD without parameters to display the current drive and directory.

Use the /D switch to change current drive in addition to changing current
directory for a drive.

If Command Extensions are enabled CHDIR changes as follows:

The current directory string is converted to use the same case as
the on disk names.  So CD C:\TEMP would actually set the current
directory to C:\Temp if that is the case on disk.

CHDIR command does not treat spaces as delimiters, so it is possible to
CD into a subdirectory name that contains a space without surrounding
the name with quotes.  For example:

    cd \winnt\profiles\username\programs\start menu

is the same as:

    cd "\winnt\profiles\username\programs\start menu"

which is what you would have to type if extensions were disabled."

The /D switch is new, allowing you to switch Drives and folders in a single command.

A nice undocumented option is the wildcard (*). Type:

cd do*

and it will switch to the "Documents and Settings" folder, the first folder to match the do<anything> pattern.