Firearms? I'm serious. I can't point to a single one I own and say it's worth less now than when I acquired it.
The money I have that I could invest is staying in passbook savings for a few months till we see what the economy does. It's not making that much right now, and if you factor in inflation it might be breaking even, but it's probably the safest place right now. When things settle down I'll probably go for mutual funds. They've been good to me in the past.
Real estate as someone else mentioned?