Description of Problem:
After a couple of years on a busy Gnome system I
took a look, what is occupying my hard drive space
and one of the space hogs was the .thumbnails
directory occupying 240 Mb in 11500 files!

Steps to reproduce the problem:
1. Use Gnoem for couple of years while seeing lots
of pictures and movies
2. du -s ~/.thumbnails

Actual Results:
240 Mb!

Expected Results:
<2 Mb

How often does this happen? 
Every couple of years :)

Additional Information:
It would be very nice if there was a cleaning
system in place that would clean the thumbnails up
some time after their creation. they could be
removed a week or a month after creation - that
would not impale performance, but elliminate the
problem.
Also the .thumbnails/failed subforder should be
cleaned more regulary, liek once a day, to give
thumbnails a chance to regenerate after a failed
capture try.