Using Truecrypt hidden volumes might be a good idea (not for 40 DVDs of tranny content though), but as someone already said, if they find out it's just gonna make them hassle you even more.
A couple of interesting articles:
http://yro.slashdot.org/article.pl?sid=08/05/15/1551246
http://ask.slashdot.org/article.pl?sid=08/10/09/1919214
http://www.guardian.co.uk/technology...uting.security
And I have developed the habit of using Eraser when I delete stuff. Don't want any sensitive info hanging around if I sell/giveaway one of my old hard drives:
http://www.heidi.ie/node/6