Slow performance at start from sleep

Lately, I've been noticing that iTunes and Firefox both have been taking extremely long times to start up when starting from sleep. iTunes and Firefox are the only programs I've had problems with. The Firefox icon will bounce for about 2 minutes and my iTunes will have the arrow under it showing it's loaded, but neither program will start for about 2 minutes.
Any idea what it could be?

MBP 2.2 with 4 gigs of RAM, pre-loaded with Tiger, upgraded to Leopard.
Same problem here! I get that problem after about 3-4 sleep/wakes (which isn't that many times if you're a student hopping from class to class).
It's good to know that turning Airport off or quitting all apps before sleeping seems to prevent this from happening, but I don't think we all paid $2K+ to have to clumsily work around some problem that ceases to exist on an $800 Dell.
Problems like this make me nervous every time I boot this thing up--I find myself holding my breath until I hear that obnoxious "bong." I'm a recent switcher to Mac. Still debating whether that was such a great idea. At least this constant uneasy feeling is compelling me to back my data up compulsively.
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