df returning inaccurate results

[Caitrin Torres <caitrin@artemista.com>]

I noticed today that df is not returning correct results. I saw that I was low 
on disk space so I deleted two files from my home directory that together 
were taking up nearly 1GB and then reran df. It returned the same numbers as 
from before I deleted files. To wit:

$df -h
Filesystem    Size    Used    Avail    Use%    Mounted on
/dev/hda5     2.8G    1.8G    939M     66%     /
/dev/hda7     10G     8.8G    822M     92%     /home

What confuses me is that du returns a very different number which *does* 
reflect the fact that I've deleted files.

$du -csh /home/*
7.9G    /home/cait
7.9G    /total

What can be causing this?

-- 
Caitrin
caitrin@artemista.com