Question regarding reported directory sizes.

[Jason DiCioccio]

I know this question may seem silly..  However, here's my scenario.

I have a very large directory (say, a mail spool) whose directory entry is 
approx 606K..
drwx------  5 cyrus  cyrus  606208 May 25 10:29 .
Now.. That directory had a lot of files in it.  However, after deleting all 
of the files in that directory, the directory entry's size stays the same. 
I realize this is fairly unimportant, however is there a way to 'garbage 
collect' that directory entry and all others like it?

Thanks!
Jason DiCioccio