Ok, I was searching for a way to disable the cheezy shutter sound, but after a few minutes of searching I got lazy and just did it myself using the most obvious method. Since I don't think it's helpful for people to blindly run commands, I'll try to explain the process a bit. This is only applicable for rooted users and there are no guarantees that this won't cause your phone's battery to explode and maim you for life. It should be pretty safe, but don't blame me if you manage to break your phone by following (or more likely not exactly following) these instructions.
High level overview: We're removing read permissions from the everyone group for the camera_click.ogg file. The camera app doesn't mind and all you can hear when taking a picture is the real shutter. I never found the "beep beep" file for when you focus, but that's a little more useful and completely avoidable if you don't focus ahead of time.
- Open ADB or your favorite shell prompt (e.g. ConnectBot)
- Gain superuser permission ("su")
- Figure out where the device mounted to /system is located ("mount", it's "/dev/block/mmcblk1p21" on my phone)
- Remount /system as read-write. ("mount -o remount,rw /dev/block/mmcblk1p21 /system")
- Remove the read permission for the everyone group on the camera_click.ogg file ("chmod 640 /system/media/audio/ui/camera_click.ogg")
- "sync" and "reboot" (not truely necessary but probably good form)
A decent file manager would let you do this with a GUI, but I haven't happened across a free one yet. "chmod" is a linux command to change file permissions. 640 means 6 = read+write for the file owner, 4 = read-only for group members, 0 = nothing for everyone else. It was 644 before we changed it. Theoretically, by minimally changing the permissions we can avoid screwing up a later system update since the file still exists and is readable and writable for the owner. It also makes our modifications a little more obvious and easy to reverse ("ls -l" to spot the changes, chmod 644... to reverse them). Also of interest might be VideoRecord.ogg in the same directory.
Edit: It looks like someone already looked into the focus beeps. Apparently, they're
part of the camera app's code, and not a file anywhere. That thread has an altered version of that app, but I'm not sure which version it is (probably not the one that came with froyo). You can also play with your volume to remove the sound, check that thread for details.