I just spent an hour gathering information for work and conveniently saving the information in Notes on my iPhone as I have been doing since I bought it in December. The other week, though, it just DISAPPEARED! Or so I thought. I later found it in my INBOX when I got home and checked my email on my computer. THIS TIME it really did disappear! I've NEVER had this happen, but the note just does not exist. I've tried replicating this by just pressing home, or locking it, or quitting Notes. This has ONLY happened since upgrading to iOS 4. What gives?! I can say I'm very lucky because this is the ONLY issue I've ever had with the iPhone, but it's a major one when I rely upon it for such things.