Patch up your browsers! Various security holes in Internet Explorer 5.5 and 6 have been filled, including three serious new ones. All users of these browsers are advised to download the patch, pronto. Oh - and if you use Office XP, you'd better have a look at this, too. I daresay we should be grateful that Microsoft is now spotting vast security holes before some hacker does, although in any other business this would still be regarded as one hell of a way to run a railroad.