Perm Space and Spool space - response (3) by VandeBergB

Greetings,
I sincerely hope that you are not managing spool space on a user by user basis.  This makes the DBA's job much more complex than it needs to be.  You should be developing a profile for each group of users, based upon the work they typically perform and managing the spool space at the profile level.
If you have created profiles and are encountering spool space issues, there are many potential reasons as Kurram points out above.  You should search these forums for discussions on "Impact CPU" and familiarize yourself with this metric to aid in your query tuning and the identification of "bad" queries.  There are several investigative queries out there that will also help you identify which queries that need to be tuned.
Understanding and evaluating the explain plan of the identified queries will help resolve your spool space issues, unless of course your box is saturated, you've assigned a very low spool space value to your profiles, or have not balanced your users/profiles/account strings with enough spool. 
All that being said, you've taken the right first step in not simply granting more spool space and you have identified that there are some other issues at play.
Thanks,
Blaine