Please make the 'sneek peaks' stop...

[BonfireOfKleenex]

It's a horrible expression anyway, made worse by the fact that it's so often mangled and misspelled.

I've even seen 'peak' for 'peek' in proper marketing emails from proper big companies. FFS - stop it!

I agree. I don't mind typos generally but I do think corporate literature should have proper spelling and grammar.

The use of 'discrete' (in pieces) instead of 'discreet' (quietly or secretly).

Discreet/discrete makes me want to shout. Shout and throw things.

Total failure to distinguish "principal" and "principle" is the one that drives me most mad. I once worked with a typist who just picked whatever one she randomly felt like and clearly thought I was entirely unreasonable to amend it.