Description of problem:
I booted with the liveCD available for the nouveau testing:
https://fedoraproject.org/wiki/QA/Test_Days/2009-03-26
with an HP Deskjet D2360 plugged into the computer.
Even before I'd logged in (runlevel 3) I saw SELinux related denials:

Summary:

SELinux is preventing the python from using potentially mislabeled files
(49cc2ecd1ce35).

Detailed Description:

SELinux has denied python access to potentially mislabeled file(s)
(49cc2ecd1ce35). This means that SELinux will not allow python to use these
files. It is common for users to edit files in their home directory or tmp
directories and then move (mv) them to system directories. The problem is that
the files end up with the wrong file context which confined applications are not
allowed to access.

Allowing Access:

If you want python to access this files, you need to relabel them using
restorecon -v '49cc2ecd1ce35'. You might want to relabel the entire directory
using restorecon -R -v '<Unknown>'.

Additional Information:

Source Context                system_u:system_r:cupsd_config_t:s0
Target Context                system_u:object_r:tmp_t:s0
Target Objects                49cc2ecd1ce35 [ lnk_file ]
Source                        python
Source Path                   /usr/bin/python
Port                          <Unknown>
Host                          leaf
Source RPM Packages           python-2.6-5.fc11
Target RPM Packages           
Policy RPM                    selinux-policy-3.6.8-3.fc11
Selinux Enabled               True
Policy Type                   targeted
MLS Enabled                   True
Enforcing Mode                Enforcing
Plugin Name                   home_tmp_bad_labels
Host Name                     leaf
Platform                      Linux leaf 2.6.29-0.279.rc8.git6.fc11.i586 #1 SMP
                              Mon Mar 23 10:42:51 EDT 2009 i686 i686
Alert Count                   1
First Seen                    Thu 26 Mar 2009 09:41:33 PM EDT
Last Seen                     Thu 26 Mar 2009 09:41:33 PM EDT
Local ID                      a739eb0e-8038-4ff8-ac31-35269f4fd136
Line Numbers                  

Raw Audit Messages            

node=leaf type=AVC msg=audit(1238118093.118:28444): avc:  denied  { create } for  pid=3174 comm="python" name="49cc2ecd1ce35" scontext=system_u:system_r:cupsd_config_t:s0 tcontext=system_u:object_r:tmp_t:s0 tclass=lnk_file

node=leaf type=SYSCALL msg=audit(1238118093.118:28444): arch=40000003 syscall=83 success=no exit=-13 a0=bfe4ad5c a1=85de558 a2=750240 a3=85de558 items=0 ppid=1 pid=3174 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="python" exe="/usr/bin/python" subj=system_u:system_r:cupsd_config_t:s0 key=(null)