quite a few were stating that it is dangerous to reuse and cork screw caps...
I suspect that might mean re using a cork that's been removed with a cork screw ? if so, it might be because it can harbour germs in the hole where the cork screw has been.
Ive just read acorns post there as well, if u intend to cork a bottle make sure the glass wall isnt thin, or damaged, because, as he says it could shatter, but personally I would have no worries about corking a bottle that has a very thick wall and has contained fizzy drinks of some sort or other, its unlikely to shatter unless you use excessive force.
Oh another thing ive experienced, is letting the bottle slip, while corking, if your rushing or slightly tipsy and the bottle is wet underneath, or the worktop surface is wet, if the bottle goes flying it will obviously smash unless your lucky.
Another handy tip is to soak the cork in warm to hot water for a while (5 to 10 mins) fully submerged, to let it soften a bit and add a bit of lubricant, I find it helps.
Also, I have a few different sizes of corks, with different tapers and use the ones which fit the bottle im corking best, to make the job easier and I would be very weary of corking any glass bottle that has a very thin wall, if it came with a screw type lid I would personally re use the original screw type lid.
Oh and if you make champagne type wine, old champagne type bottles are the best bet which allow for a wire frame to be fitted, or, your cork may well blow out.