Best technologies: 3D modeling programs (well, obviously), a fission system so simple you really CAN build one from home supplies, the helicopter (I dunno, I just like helicopters. So much better than cars, planes, etc. I want one. A big, ugly gray one.)\
Worst technologies: Chatrooms/IRCs/ICQ. No need for an explanation there- if you don't know why these things are an abomination worse than the feared Pepsi commercial, you're likely part of the reason I hate them. The new, largely Microsoft-spawned demons of the internet such as Macros, enabling script kiddies to hit me without me even opening the email and popup ads to dance obscenely about my screen and conceal their close buttons. And the TV.
My fourth worst would be the car, and my fifth the telephone (though it made the internet possible, the Plastic Bastard jams my DSL line and enables annoying, stupid people to harass me all night long. In fact, rank the answering machine right above the phone, 'cause it means I don't have a good excuse for never returning calls except "I can't stand you, burn in hell." Which isn't too good for business deals.) After that, put genetically engineered viruses and all the other things that make us die horribly along those lines. At least they kill the stupid telephone people, too.