You are the first person that I had heard of that doesn't have a task killer and still has this issue. Would you mind listing the apps that you have installed? If Nick does the same, we may find a culprit in the list.
Sure sure:
2 player reactor
Allpoint
Amazon
Amazon MP3
Any Cut
AppAlarm LITE
Backgrounds
Barcode Scanner
Bonsai Blast
Compass
Doom
Evernote
Footprints
Frozen Bubble
Gameboid
Google Sky Map
Google Talk
gTasks
Handcent SMS
Jewels
Key Ring
Listen
Open table
Pandora
PDF Viewer
Pinball
Places Directory
Power Manager
Quickcopy
Quickoffice
Shazam
ShopSavvy
Snesoid Lite
Sound Manager
Stocks
TV.com
Twit.tv by Media Fly
Yelp
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