[cheebacheeba]

I try to, but can't say I always do...

I guess it depends what's at stake - Obviously if it's work related and I fucked up, if someone else isn't going to get blamed for it I'd just as soon not admit it if it meant my job...that said I'd sure try not to do it again.
I'm not going to lie - of course if it meant my job, I'd keep it quiet if nobody else, or general safety wasn't at risk...if you've just pissed off a narky manager who's trigger happy, of course that's where I'd dodge out.

If it meant a promotion to keep my mouth shut every time I fucked up, something inside would tell me I wasn't exactly the guy for the job.

If someone elses job/livelihood were hanging on the line, I'd admit responsibility without question even if it were someone I personally disliked...I'd never let my mistake fuck someone else over...just can't do that.

If it's a trivial matter, I'll generally throw out a "my bad", explain the situation if it needs explaining and see what I can do to fix it.