i had the same problems with the calendar and pretty much everything else.
i think its a case of give it time, surely there must be big plans for it, i simply cant believe it sucks the life out of all the resources for the aero novelty, i couldnt find one program to work without crashes, you can click control panel and problems and there are loads, only solitions i ever had were 'known incompatibility problems' well the upgrade advisor never mentioned any!
I think when programs are written for vista they may actually work quite well. blizzard (world of warcraft) have just had it tested, better late than never! and found there 800 mtz 512 mg ram 32 mb gpu program to struggle to get 39 fraps and averaging 19 all this with 100$ cpu usage and crashes on a pretty high spec machine.
i use xp again now, but before i bought vista home premium i used the upgrade advisor which told me i had 2 problems, nvidia network driver (which worked fine) and norton ghost. after an upgrade installation and secondly a clean install, i found that a nearly full 160gb hdd didnt have a program that fully worked at all.
now if the upgrade advisor had told me i would be playing chess titans and hearts till someone wrote something that worked on it, i probably wouldnt have wasted my time and money, i am however very curious to see why it needs so much resources, i think maybe it has something up it's sleeve, we shall have to wait and see.