Yup, I've been checking that out for a while. It's not that big an issue anymore with the arrival of Thunderbolt (is that what it's called ? It's early here).
It seems to me that apple is trying to make iMacs into appliances, like a fridge or a washing machine, only not as long lasting. Don't like it anymore ? Throw it out !
Shame though. I'd just about convinced myself to buy an iMac after the summer holidays...now, I'm not so sure anymore.