@AC, why call it pr0n?
Cos some berks still use filters that "string-slice" and if you type the word in correctly, they throw hissyfits.
As any reasonable IT Support person knows though, you don't use IE to surf for that sort of thing even if you are dumb enough to do it at work. Not unless you want all sorts of people knowing what you're looking at...
If you are dumbass enough to do stupid things like pr0nsurf at work, make sure you have a relatively up-to-date image of your hard drive (without all the dodgy stuff, natch) so when the EvilStevies come looking, you swap *your* HDD into someone else's machine, reimage the disk from *their* machine to look like yours, pop it into your machine and then pretend nothings going on...
Of course, if you are a Manager and want to get rid of one person but want to keep the others and you know they have *all* been up to dodgy stuff, just start a Project that requires "older" machines and give the new machines to the staff you want to keep. If all the 'old' machines have to be degaussed and renamed (several times) so they are untracable, it will only take a decent Desktop Support Team a few days to do.
Just make sure you don't send an email advising everyone to delete any "unwanted" data before dropping the target in the crap. Or if you must, don't let your target find out about it since it makes a good case for Unfair Dismissal.
Skull-and-Crossbones for the bastards who tried to do over me this way.