I can't think of any, other than fishing the camera sites like dpreview for threads on the topic. For me, I honestly really learned about metering a good 20 years into my photography. For the first 20 years shooting with film SLRs, I just didn't know much at all about metering or how to set it - I mostly let the camera do the work (even with manual aperture film cameras, mine still had a little light meter inside, and my goal was to just get the needle somewhere in the middle - I didn't even know why!). Then in 1997 I got my first digital camera, an old floppy-disk FD91 - and it had one important feature which taught me everything I'd ever need to know about metering - a spot meter with a live view. By using the spot meter, and moving about a scene while looking at the LCD - I could literally see the metering changes as I moved, and also see how the camera's aperture/shutter settings changed in relation to the darker/lighter scene. Spot meters are nice and sensitive, so moving across a chessboard in daylight, from black square to white square, results in massive metering differences. It gave me my introduction to what settings were needed for what conditions. Parlaying that into center-weighted metering modes and multi metering modes, I could still get a feel for when I'd be over or underexposing even with an optical viewfinder by glancing at my aperture/shutter when I half-press. I figured out how multipoint metering 'averaged' the scene and over what broad area...then saw how center-weighted metering similarly averaged the scene, but threw a little more importance on the metering in the center of the frame when doing its average. If I was pointing at that landscape above and the majority of the camera's center area was sitting in that tree's shadow, I'd be able to see by the camera's chosen settings that the shutter speed was too slow, or the aperture too large, for the rest of the scene, and would dial in a little -EV to compensate.
Of course, with the NEX you still have the better tool for learning - you have a live view camera that shows you on screen how the exposure is going to look. The problem above for Amy was that she may have been having toruble seeing the LCD well enough to judge the exposure, but assuming you could work around that issue and see the LCD, you could make the adjustment to the metering, or the EV, and see the screen brighten or darken the shadows as needed - once you get the metering just right, half-press the shutter to lock it, and fire. Using that information in the future, you can start to gather by the chosen shutter/aperture combination for your best shot what settings to aim for next time you're shooting in similar light.
Over many years, it just built up to insinct for me now - I've done it long enough and started to memorize the appropriate shutter/aperture needs for different light conditions...so I can usually get decent exposures even with an optical viewfinder. There are a few good metering rules you can learn if you go the 'class' route, which I never did - I've since learned some of those rules (Google 'Sunny 16' if you've never heard of it...it's one of the staples of nailing daylight exposures)...but they could be good tips to learn.
