Reordering columns in a table

Is there a way to change the order of columns in a table in Postgres
after it has been created?  Back when I used MS SQL Server, it was
trivial to go into Enterprise Manager and move columns up and down.  I
find this a desirable feature, as I like to keep like columns grouped in
my table.  Sometimes I add a column after table creation that makes more
sense grouped with columns toward the top of the table.

John