Crosstab query

I need to create a query that will show the last N months of data for each person in the database.  Here's a simplied version of what my table would look like:

create table test_table (
      personid int,
      value int,
      cdate date)


personid value cdate
-------- ----- ----------
1        100   08/01/2003
1        200   09/01/2003
1        300   10/01/2003
2        400   08/01/2003
2        500   09/01/2003
2        600   10/01/2003

Let's say that I just want to show the last 3 months of data.  Here's what I would like the query to return:

personid  08-2003   09-2003   10-2003
--------  -------   -------   -------
1         100       200       300
2         400       500       600

I actually don't even need the columns to read like shown.  They could be like this:

personid  date1     date2     date3
--------  -----     -----     -----

Anyone have any ideas???