Odd permission string. What's it mean?

[Madison Kelly]

This is a new one on me:

digimer at akane:/media/disk$ ls -lah
total 3.6G
drwxr-xr-x  9 digimer digimer 4.0K 2008-05-12 10:42 .
drwxr-xr-x  7 root    root    4.0K 2008-05-12 11:01 ..
-rw-------+ 1 digimer digimer 1.6K 2008-05-01 13:29 anaconda-ks.cfg.1
-rw-------+ 1 digimer digimer 1.7K 2008-05-01 14:18 anaconda-ks.cfg.2
-rw-------  1 digimer digimer 2.1K 2008-05-06 09:04 anaconda-ks.cfg.3
drwxr-xr-x  2 digimer digimer 4.0K 2008-05-12 10:21 c4_rpms
drwxr-xr-x  2 digimer digimer 4.0K 2008-05-12 10:20 c5_rpms
drwxr-xr-x+ 7 digimer digimer 4.0K 2008-05-12 10:21 cc_cd1
drwxr-xr-x+ 2 digimer digimer 4.0K 2008-05-01 13:40 cc_cd2
-rw-r--r--  1 digimer digimer 3.6G 2008-05-01 12:01 
CentOS-5.1-i386-bin-DVD.iso
-rwxr-xr-x  1 digimer digimer 8.3K 2008-05-06 09:04 install
-rw-r--r--  1 digimer digimer  747 2008-05-06 09:04 install.conf
-rwxr-xr-x  1 digimer digimer  75K 2008-05-06 09:04 install.lib
-rw-r--r--  1 digimer digimer  857 2008-05-06 09:04 install.requirements
-rw-r--r--  1 digimer digimer  29K 2008-05-06 09:04 install.words
drwxr-xr-x  2 digimer digimer 4.0K 2008-05-01 16:08 kickstart
-rwx------  1 digimer digimer 2.1K 2008-05-12 10:42 ks.cfg
-rw-r--r--  1 digimer digimer  223 2008-05-06 09:13 labzilla.conf
-rwxr-xr-x  1 digimer digimer 1.7K 2008-05-08 21:21 labzilla_install.pl
-rw-r--r--  1 digimer digimer 9.7K 2008-05-12 10:17 labzilla.lib
-rw-r--r--  1 digimer digimer 2.6K 2008-05-06 09:45 labzilla.words
drwx------  2 digimer digimer  16K 2008-04-30 17:11 lost+found
drwxr-xr-x  2 digimer digimer 4.0K 2008-05-08 21:07 TB
-rw-r--r--+ 1 digimer digimer 209K 2008-05-01 14:30 yum.list

   Notice the '+' signs at the end of a couple of those file's mode 
strings? Any idea what they are or what they mean?

   Thanks!

Madi
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