<p>Does anyone know of a good Command Prompt replacement?  I've tried bash/Cygwin, but that does not really meet my needs at work because it's too heavy.  I'd like a function-for-function identical wrapper on cmd.exe, but with highlighting, intellisense, and (critically) a tabbed interface.  Powershell is okay, but the interface is still lacking.</p>

Edited
: I've been using
ConEmu
(
http://conemu.github.io/
) for quite some time now. This one is a wrapper too, since it is not really possible to replace the Windows console without rewriting the whole command interpreter. Below the line is my original answer for an earlier alternative.
Not exactly a replacement (actually, it's a prettifying wrapper) but you might try
Console
(
http://sourceforge.net/projects/console/
)