Tech Support Cheat Sheet [xkcd.com]
xkcd.com is one of my favourite comics on the web. It strikes just the right balance of geeky witty humour without being too smart-ass.
I liked this recent one a lot :-)
A couple of other favourites:
http://xkcd.com/149/ http://xkcd.com/327/ http://xkcd.com/123/