When people use they're, their, or there incorrectly.

And now Youtube is annoying me even worse. I couldn't watch FOUR seconds of a video without it freezing. Seriously, it's too damn slow. No other website ever has this problem, just Youtube. Reason one to hate massively popular sites; they end up too slow and also too much filled with ads and commercialisation.

PHP and server side scripting guides. They're generally hypocrites. They preach Super Globals, then don't use them in 99.9% of the examples in their tutorial. And how guides for HTML and CSS are generally teaching techniques from the 90s, such as table layouts, background image side bars, moving stuff and all that sucks.

The seeming fact that the less legal something is, the more people come to read/download/use it.

Votes/polls/online democratic site management. Generally degenerates to cliques of aged, xenophobic veterans corrupt with power. And how most contests are not about how good a site/forum is, how well it was modded/designed etc, but more about the person who runs it or the service the site does. Give a choice between a service site for a product and a really, well designed, modified site which uses it's software choices to the max, and generally the former will win.

How intelligent, meaningful stuff is ignore in favour of simple and spammy stuff like 'What did you have for breakfast?', or something in popular culture.

How very few forum images are made transparent. I make every one of my custom smilies transparent generally, while most people just leave them with a white background. Heck, it's annoying that no forum default smilies for any software are transparent as well.

ignorance is about the only thing that annoys me..

Ignorance from someone not bothering to try - annoys me,
ignorance from someone wanting to learn - I have all the time in the world to correct,
ignorance from bad manners - is unforgivable.

I have to agree with most that has been said so far but my biggest hate is when a site wont let you download something you need from FF and you have to resort to using IE or find an alternative.

Tinks

I like flash when it's done elegantly such as http://www.mhq.nl/

that and

Pop-up/under ads ->:mad:
ppl that are e-tough ->:down:
chatroom spammers
and other kinds of spammers

Agree with pop-up and under ads being bad, as well as annoying (and sometimes illegal, some phishing websites use pop unders to make it look like the fake website is part of the real one). Plus, anyone running these is basically giving the advertisers free reign to put offensive/unpleasant stuff or dangerous scripts or the like on their site.

Also agree with spammers being annoying. Basically a universal opinion among most people online.

As for e-tough, I have no idea what you mean.

well,

What get's me REALLY crazy is that when people use a new window to open stuff when it is not really needed i mean sometimes it is usefull links and stuff are opend in a new window but no always...

that and offcource spammers we all hate them sometimes they make me so angry i'll go after them yelling at there ISP / hoster :D

Your and you're as well.

My other annoyance is having to pay to view content. Seriously, why should ANYONE have to pay to view content? It's not a service, nor a general product that can be sound, and unlike a product, stuff of same/better quality can be found elsewhere free.

Same with premium VIP forums. Why withold possibly useful content to those that pay? Those that do so are not exactly better people than those who don't, nor should be given a competitive advantage or the like over those who don't pay.

I feel selling a product, or certain services or ad removal is fair though.