indenting lisp macro code

[Lowell]

I am having trouble getting emacs to properly indent code representing 
lisp macros. That is, if I were to create a macro called let1 (which is 
similar to a let) I would want the next line of code to be lined up 2 
columns over from the previous line. However, emacs thinks let1 is a 
function and tries to line up the next line in line with the 
s-expression that comes after the macro name (am I confusing you yet?)

Here is an example:

I want:
(let1 (foo bar)
  (...

I get:
(let1 (foo bar)
      (...

The ideal solution IMO would be to have a way of telling emacs which 
keywords should be indented like a 'let' so that emacs will realize they 
are not functions. This is how it is done in DrScheme.

Finally, I've cross posted this since I didn't know which newsgroup it 
belonged on, so if it is inappropriate for either of the newsgroups, 
please let me know.

Thanks in advance,
Lowell