Massive tantrums here, too, Simpson....which has been quite surprising as T has always been my super-easy angel (relatively!) baby, unlike M who is just a born diva. In fact we got through the terrible twos fairly easy but the last couple of months have been extemely difficult challenging.
T drives me up the wall - she'll be deep in full-on-tantrum mode, crying her eyes out and rolling around on the floor, and eventually, at the end of my tether, I'll say something like "if you haven't done x by the time I count to 3, there'll be no ".
And the little so-and-so will bounce off the floor with a massive grin and take it as a personal challenge to complete the task before I get to 3.
Oh the one hand, it works (mostly). On the other hand, it drives me mad that she can switch the massive tantrum behaviour on and off like that.
I have to share our stupendously great news.....we just got selected for the Xbox 360 trial!!! 
I never thought we stood a chance. DH and I have been holding out against getting a games console for pretty much forever, and I am quite worried that the children are going to want to spend a lot more time in front of the tv (we don't really put it on for them or us during the week at all these days) but at the same time I know that they would have a huge amount of fun with it (and so would dh and I....) and that its something that A, especially, is very aware of 'not having' compared to most of his friends.
So, hurrah :) :)