MD5 weakness ? [was Re: Netscape Logic Bomb detailed by IETF]

DOCTOR Frederick B. Cohen writes:

[...] uses an MD5 checksum which the members of this list seem to place unlimited trust in (incorrectly in my view, but that would be picking two nits with one keyboard entry).

Can you elaborate with facts on the supposed weakness of MD5 ? [btw who talked about 'unlimited' trust ?] dl -- Laurent Demailly * http://hplyot.obspm.fr/~dl/ * Linux|PGP|Gnu|Tcl|... Freedom Prime#1: cent cinq mille cent cinq milliards cent cinq mille cent soixante sept AK-47 PGP domestic disruption CIA cracking strategic Clinton