Remember that just because an applet is signed
doesn't guarantee much. A bit like buying a used car: how much more useful is it to have a bit of paper from the used-car salesman, saying the car's in perfect nick, as opposed to just hearing him say it ? A signature is only useful if you trust the person or oganisation signing the certificate (and that includes checking for certificate revocation.) Signatures can be very useful, but only if they are used correctly -- blindly trusting a signed applet
merely because it
is signed will likely end in tears...