Indeed, I'm a very very heavy apps user on the phone (no, not just games. :P ) and i've noticed the phone needs to be rebooted AT LEAST daily in order to clear the memory. Otherwise it starts crashing apps almost as soon as you launch them.
Very dissapointing, but I guess it's to be expecting with third party apps.
BTW - Those of you waiting for the White phones, pretty much every store now has a huge stock of them now, they started getting large shipments of them this week (I think due to the cracking issues being fixed).