TYPING ALL IN CAPS -- if you're not a lolcat, it's shouting.

Having an email addresses that is anything other than your name, "loopy_lottie" or "ice_queen89". Do you put that address on your CV?

Having an email address for more than one person "gillandbob@hotmail.com", it's not like a postal address, dammit.

Blog posts that say how hard it was to come up with something to write that blog post about -- the best bit about blogging is that you don't have to write when you have nothing to say. You're not journalists. (As an aside how good would it be if Nick Owen sometimes said "not enough news for half an hour today, here's Tom and Jerry?".)

People who forward you their holiday snaps as email attachments -- put them on the sodding web, send me a link. Easier to ignore that way you see.

Clip art --Microsoft clip art especially, and those tubby jumping stickmen in particular, I will not attend your event if you use it. I may lose all respect for your design sensibilities, no I have already, too late.

Comic sans -- it's not big, it's not clever (although I'm waiting for the time to start using it in a post-modern way).

Emailing everyone at work to tell them you're going to be out of the office - shared calendar, out-of-office , or just tell them if you think they care.

Reply to all - it's almost never necessary.

Centering text on the web. Yes you Mr Goldberg, I'm glad you've stopped that.

Forwarding 'humourous' Powerpoint presentations that make some weak joke about the difference between the sexes -- and if you leave everyone's email addresses in a long chain of forwarding I will kill you.

I feel better now. What annoys you?