I'm on my second e1505/6400, and actually I'm JUST setting up the new one right now. Both seem to have the highpitched sound. I'm not sure that the issue is isolated. I remember though when I first got this first system, the whine was much more annoying. I think. This new one seems to be a bit better and quieter. The screen is also much nicer but thats a different story.
I have a theory, and its that most of the recent e1505's produce this high pitched whine, but a lot of people cannot hear it because the frequency is very high. In fact, the issue reminds me a lot of this: http://gearlog.com/blogs/gearlog/arc.../12/13650.aspx
...its that new cellphone ringtone that is a really high frequency buzz that only teenagers can hear. I suspect this because my dad can't seem to hear the high pitched whine, but I can. Just a theory though. However I found that after using the notebook for 2 weeks, It stopped bothering me. However, that didn't stop me from ordering a new notebook lol, and now I'm glad I did.
During the course of the two weeks, I actually came across two solutions that got rid of the high pitched whine 90%. You have to download i8kfangui, and set the fan speed to constantly run on low. Then download rightmark, and there is an option under the management and profiles tab that says " RUn HLT command when OS is idle " I think that the issue has something to do with the core duo. It seems to emmit the buzz when the CPU is not under load, so I THINK this command forces it to not be under 0% load. Give it a try and see if it works for you.
Hope this helps!